" So in a phrase, preaching is expository exultation. In conclusion, then, the reason that preaching is so essential to the corporate worship of the church is that it is uniquely suited to feed both understanding and feeling. It is uniquely suited to waken seeing God and savoring God. God has ordained that the Word of God come in a form that teaches the mind and reaches the heart. "

― John Piper , The Supremacy of God in Preaching