Christ, in his person, and offices, and sufferings, is the sum and substance of the gospel, and ought to be the great subject of a gospel minister's preaching, but not so as to leave out other parts of God's revealed truth and will.
Paul preached the whole counsel of God. Few know the fear and trembling of faithful ministers, from a deep sense of their own weakness They know how insufficient they are, and are fearful for themselves.
When nothing but Christ crucified is plainly preached, the success must be entirely from Divine power accompanying the word, and thus men are brought to believe, to the salvation of their souls.