if you're not gripped by God's Word when you preach then bank on it—no one else will be gripped by it either.
Gordon Fee writes:
"Remember: Sermon preparation without personal encounter with the Word and without prayer will probably lack inspiration; and sermons preached by those who have not themselves sat in awful silence before the majesty of God and His Word will probably accomplish very little" (Gordon Fee, New Testament Exegesis, 3rd ed., p.152).