It is an obvious error for all to see in those ministers of the Church who make such a wide gulf between their preaching and their living. They will study hard, to preach exactly, and yet study little or not at all to live exactly. All the week long is little enough to study how to speak for two hours; and yet one hour seems too much time to study how to live all the week. They are loath to misplace a word in their sermons; yet they think nothing of misplacing affections, words, and actions in the course of their lives. Oh, how curiously I have heard some men preach, and how carelessly have I seen them live!
~ Richard Baxter (1615-1691)
A Prayer Life 