Spiritual Disciplines for the Christian Life

Whitney emphasizes that spiritual disciplines are means of grace rather than ends in themselves. What sort of evidence (biblical, historical, analogical, etc.) does he offer in support of this position?

Whitney frequently draws on Puritan writers such as John Owen and Richard Baxter. What Puritan theological emphases are most evident in Whitney’s treatment of the disciplines?

Compare Whitney’s presentation of the spiritual disciplines with Richard Foster’s Celebration of Discipline. In what ways do their emphases overlap, and where do they diverge?