He spent significant amounts of time studying and writing his sermons and lectures in advance. Henry preferred to use an expository speaking style. For each speaking engagement, he would employ different base texts to expand upon his general topic. His approach to teaching was "Choose for your pulpit subjects the plainest, and most needful truths; and endeavor to make them plainer." When writing, he would remain close to the literal interpretation of biblical passages. These writings would later form the basis on which he developed his commentary.