That the sermon, if it is to be a Christian sermon at all, must be an honest attempt to expound a passage of Scripture should go without saying. To by-pass Scripture at this point is like trying to celebrate the Holy Supper without bread or wine; it is to show that one is ignorant of the commandments and promises which determine Christian worship.
But it is not enough just to take a text. To take a text and then proceed to use it as a peg on which to hang one’s own thoughts is as bad as having no text at all: it is to handle the Word of God deceitfully and to insult the Lord who wills to speak to his people through the words of Scripture. But to say that preaching must be expository is not to say that it must not be topical in the sense of having direct relevance to contemporary events. On the contrary, the scriptural passage has not been properly heard and understood, until it relevance to the actual concrete situation of the congregation has been recognized; and the more patiently and honestly expository preaching is, the more relevant and contemporary does it become. Of course it is true that there is a sort of exposition that leaves everything in the air, but that is no proper exposition. A scriptural passage is not properly expounded until its relevance to the hearers becomes plain.
—C. E. B. Cranfield, “Divine and Human Action,” Interpretation 12:4 (October, 1958):393