The three volumes of Clarkson’s Works published in 1864-65 well illustrate his preaching powers. His expositions are characterised by faithfulness to biblical teaching, by careful analysis and exposition, and by copious application.

As a preacher, Clarkson expressed himself forcefully and memorably. These powers, happily married to a clear and logical mind, gave birth to sermons which are full of striking expressions and fruitful insights.