Take heed, therefore, to yourselves first, that you be that which you persuade your hearers to be, and believe that which you persuade them to believe. ... It is a palpable error of some ministers, who make such a disproportion between their teaching and their living; who study hard to preach exactly, and study little or not at all to live exactly. ... We must study as hard how to live well, as how to preach well.