The book begins with a short prayer addressed to God, acknowledging that all hearts and wills are open to Him. The author asks God to cleanse his heart’s “intent” with grace so that he may love and praise God perfectly.

The author issues a stern charge to anyone who comes into possession of the book. He insists it should only be read by (or spoken of to) individuals who are sincerely and wholly dedicated to becoming perfect followers of Christ in the “sovereignest point of contemplative living” (15). He warns against sharing it with those unsuited for its message, including gossips, critics, and the merely curious, whether they are learned or unlearned. The work is not for those engaged only in the “active living” of good deeds, unless they also feel an inner stirring toward contemplation. The author advises reading the entire book before forming judgments, as some ideas are explained gradually. He notes that the book contains 75 chapters, the last of which provides signs for determining if one is truly called to this contemplative work.

The author outlines four stages, or “degrees”, of Christian life: Common, Special, Singular, and Perfect. He tells the book’s recipient, whom he addresses as “Ghostly friend in God” (17), that the Lord has mercifully guided him through these stages. The recipient began in the “Common” degree, living among worldly friends. God then “kindled thy desire” and led him to a “Special” state (17), to be a dedicated servant of God. From there, God has now “privily pulled thee” to the third degree (17), the “Singular” life of solitude. This solitary stage is intended as a preparation to “lift up the foot of thy love” and move toward the final and “Perfect” state of being (17).

The author urges the reader to embrace humility and avoid pride in his special calling. He warns that being chosen for this path makes one more accountable; without proper effort, the calling will only lead to greater condemnation. The key to spiritual progress is to focus entirely on “desire”, an act of the will initiated by God but requiring the individual’s consent. God, described as a “jealous lover,” will not share the will with any other and only requires that the contemplative “look on Him and let Him alone” (18). The person’s role is to guard their mind—the “windows and the door” (18)—from distracting thoughts. This state is achieved by meekly and persistently turning to God in prayer, as He is always ready and waiting.

This chapter details the central spiritual exercise of the book. The contemplative must “lift up thine heart unto God with a meek stirring of love” (19), focusing on God Himself rather than His gifts. The goal is to forget all of God’s creation—every creature and all their works—so that nothing occupies the mind or will except a “naked intent unto God” (19). This practice, the author claims, is the work that most pleases God, delights angels, infuriates demons, and benefits all souls on earth and in purgatory, though in ways “thou wottest not how” (19). Moreover, the contemplative is “cleansed and made virtuous” by this approach (19). Initially, this effort feels like entering “a darkness” or “a cloud of unknowing” (19), where nothing is perceived but the bare intention toward God. This cloud separates the soul from God, preventing clear understanding or feeling. The aspirant is instructed to remain patiently in this darkness, continually “crying after Him that thou lovest” (19).

The author clarifies that the contemplative act is not a prolonged effort. It is the “shortest work of all” (20), lasting no longer than an “atom”, the smallest indivisible unit of time. This “atom” corresponds to a single “stirring” of the will. While God is incomprehensible to the intellect, He is fully comprehensible to the loving power—“the endless marvellous miracle of love” (20)—so that a single loving soul can embrace the infinite God. The author then addresses the reader’s potential despair over wasted time, explaining that through love for Jesus, one can join a spiritual community with Mary, the angels, and the saints, sharing in their perfect use of time.

He gives an important warning against approaching this work with the intellect or imagination. Attempting to reason out or visualize this process is a “perilously deceived” path that can lead to “madness” (“frenzies”) or demonic delusion. The “darkness” and “cloud” are not physical phenomena, but metaphors for a “lacking of knowing” (22). The cloud is a “cloud of unknowing” that exists between the contemplative and God (22).

The author introduces a complementary concept to the “cloud of unknowing” (23). Just as the Cloud of Unknowing stands above the contemplative, separating them from God, they must place a “cloud of forgetting” below them (23), separating them from all of creation. This cloud must obscure not only all creatures but also all their works and conditions, whether good or evil. Any thought of a created thing, no matter how holy, acts as a “ghostly light” that draws the soul’s attention away from God. Therefore, in this specific work, even meditating on God’s goodness, the saints, or the joys of heaven is a hindrance. The contemplative should instead focus on the “naked being of Him” alone (23).

The author directly addresses the central paradox of his teaching. When asked, “How shall I think on Himself, and what is He?”, he replies, “I wot not” (24). This question, he explains, leads directly into the “darkness” and “cloud of unknowing” that is the goal of the contemplative work. One can think about God’s creations and deeds, but “of God Himself can no man think.” Therefore, the proper method is to abandon everything that can be conceived by the intellect and instead “choose to my love that thing that I cannot think” (24). The author concludes with the foundational principle: God “may well be loved, but not thought” (24). The contemplative must cast aside all thoughts, even good ones, and “smite upon that thick cloud of unknowing with a sharp dart of longing love” (24).

This chapter provides practical advice for dealing with distracting thoughts. If a thought arises asking what is being sought, the answer should be simply “God”. The contemplative must reject the intellect’s attempts to analyze God’s attributes, such as His mercy or kindness, or to lead the mind into meditations on Christ’s Passion or one’s own sins. While these meditations are essential for beginners, those undertaking this higher form of prayer must put them under the “cloud of forgetting” (25).

The core of the practice is to maintain a “naked intent direct unto God” (25). To aid this focus, the author suggests using a short, single-syllable word like “GOD” or “LOVE.” Such a word acts as a “shield and thy spear” (26), used to beat on the Cloud of Unknowing above and to strike down all other thoughts below. If the intellect tries to analyze this word, the contemplative must insist on holding it “all whole, and not broken” (26).

The author clarifies the nature of the “holy” thoughts that arise during prayer, identifying them as the workings of one’s “natural wit,” or reason. This faculty is inherently good, being a “beam of the likeness of God” (27). Its use is good when it aids meditation on sin, the Passion, or God’s creation. Its use becomes evil, however, when it is driven by pride, intellectual curiosity, or worldly desires.

To explain why this good faculty must be suppressed, the author outlines the two forms of Christian life: the Active and the Contemplative. Each has a lower and a higher part. The higher part of the Active life (spiritual meditation) is the same as the lower part of the Contemplative life. Crucially, active life “is both begun and ended in this life” (28), while contemplative life “is begun in this life, and shall last without end” (28). To reach the highest part of contemplation, which “hangeth all wholly in this darkness and in this cloud of unknowing” (28), one must cease from the lower part. Just as one would not be distracted by worldly duties during meditation, one must not be distracted by meditations during the higher work of pure, loving attention to God’s “naked being.” In this life, the intellect is always mixed with “fantasy,” which can corrupt the work and lead to error.

The author insists that the “sharp stirring of thine understanding” must be constantly suppressed during contemplative work (29). Otherwise, even when the mind seems focused on God in the darkness, it will actually be occupied with “a clear beholding of some thing beneath God” (29). The author makes the radical claim that a “blind stirring of love unto God for Himself” is more spiritually profitable and pleasing to God than having a clear vision of all the angels and saints in heaven (29). This direct feeling of love is the highest attainable state in this life. Because any thought of a good and holy thing under God is a hindrance, the thought of any worldly or sinful thing is an even greater obstacle. The author reiterates that he is not calling holy thoughts evil, only that they are a distraction during this specific work.

The author distinguishes between different types of thoughts and their relation to sin. A “naked sudden thought” of a person or worldly thing is not itself a sin (30), but an unavoidable consequence of original sin. If, however, this thought is not immediately dismissed, it can lead to an emotional reaction of either “liking” or “grumbling,” meaning an aversion. For a devout person committed to God, this initial reaction is only a venial sin. The thought becomes a mortal sin only when it is deliberately entertained and the will gives its “full consent.” The author then links these consented thoughts to the seven deadly sins: Thoughts of aversion can lead to Wrath, Envy, or Sloth, while thoughts of delight can lead to Pride, Covetousness, Gluttony, or Lechery.

Building on the previous chapter, the author emphasizes the need to weigh every thought and spiritual stirring carefully. He warns against “recklessness in venial sin” (32), arguing that anyone who fails to guard against the very first stirring of a distracting thought will eventually become careless about committing lesser sins. Although no one can entirely avoid venial sin in this life, all true disciples of perfection must strive to avoid becoming reckless about it. Failure to do so, the author suggests, is a direct path to committing mortal sin.

The author returns to the idea of beating on the cloud of unknowing with a sharp dart of longing love, declaring that it is the only work that can destroy “the ground and the root of sin” (33). Traditional ascetic practices like fasting, vigils, or self-mortification are insufficient. Even devout meditations on Christ’s Passion or the joys of heaven, while beneficial, are insignificant compared to this “blind stirring of love” (33). This work, which he calls the “best part of Mary” (33), not only eradicates sin but also cultivates all virtues in their perfect form. He defines virtue as “an ordained and a measured affection, plainly directed unto God for Himself” (33). Any virtue motivated by a cause other than God alone is imperfect. He proposes to illustrate this using the examples of meekness (humility) and charity.

The author defines meekness, or humility, as “a true knowing and feeling of a man’s self as he is” (34). He identifies two causes (or types) of meekness. The first, which is “imperfect,” arises from the knowledge of one’s own wretchedness, frailty, and sinfulness. The second, which is “perfect,” comes from contemplating the “over-abundant love and the worthiness of God in Himself” (34), an experience so overwhelming that it humbles all of creation. Perfect meekness is achieved when the soul is so absorbed in God that it “suddenly and perfectly lost and forgotten all witting and feeling of his being” (34), no longer conscious of whether it has been holy or sinful. This state is fleeting. When the soul is conscious of both its own state and God’s greatness, its meekness remains imperfect, though still necessary and good.

The author clarifies that one cannot bypass imperfect meekness to achieve perfect meekness. For a sinner, the difficult work of self-knowledge—to “swink and sweat […] for to get thee a true knowing and a feeling of thyself as thou art” (35)—is a necessary prerequisite to knowing God. He explains that his reason for distinguishing between the two forms of meekness is twofold: first, to show the superiority of the contemplative work, and second, to guard against pride. Without understanding the nature of perfect meekness, a person might mistake the imperfect form for the final goal and become proud of their supposed humility, trapping themselves in “foul stinking pride” (35). He states that perfect meekness is a state in which a person cannot sin.

The author refutes the idea that the only true cause of meekness is the remembrance of one’s own sinfulness. While this is the most necessary starting point for “accustomed sinners,” he argues that there is a higher cause available to both amended sinners and those “innocents” who have avoided grievous sin—a cause “as far above this cause as is the living of our Lady Saint Mary above the living of the sinfullest penitent in Holy Church; or the living of Christ above the living of any other man in this life” (36). To prove his point, he presents a rhetorical question: What is the source of meekness for Jesus, the Virgin Mary, and the angels in heaven, who have no wretchedness or sin to contemplate? He concludes that since Christ calls his followers to be “perfect by grace as He Himself is by nature” (36), there must be a form of perfection that transcends the mere awareness of sin.

The author assures the reader that it is not presumptuous for a reformed sinner who is called to contemplation to undertake this advanced work. He uses Mary—“in person of all sinners that be called to contemplative life” (37)—as the prime example, stating that when Jesus forgave her, it was not for her sorrow but “because she loved much” (37). This demonstrates the supreme power of love over all other spiritual works. Although sinners should feel deep sorrow, their primary focus, like Mary’s, should be on a longing for God that surpasses grief over sin. He explains that Mary did not dwell on a detailed analysis of her past sins, which would have been counterproductive. Instead, she “hung up her love and her longing desire in this cloud of unknowing” (37). Her focus on loving God was so complete that, at times, she had little memory of ever having been a sinner and paid little attention even to the physical presence of Jesus before her.