From Lectures to My Students:
The minister who does not earnestly pray over his work must surely be a vain and conceited man. He acts as if he thought himself sufficient of himself, and therefore needed not to appeal to God. Yet what a baseless pride to conceive that our preaching can ever be in itself so powerful that it can turn men from their sins, and bring them to God without the working of the Holy Ghost. If we are truly humble-minded we shall not venture down to the fight until the Lord of Hosts has clothed us with all power, and said to us, "Go in this thy might." The preacher who neglects to pray much must be very careless about his ministry. He cannot have comprehended his calling. He cannot have computed the value of a soul, or estimated the meaning of eternity. He must be a mere official, tempted into a pulpit because the piece of bread which belongs to the priest's office is very necessary to him, or a a detestable hypocrite who loves the praise of men, and cares not for the praise of God. He will surely become a mere superficial talker, best approved where grace is least valued and a vain show most admired. He cannot be one of those who plough deep and reap abundant harvests. He is a mere loiterer, not a labourer. As a preacher he has a name to live and is dead. He limps in his life like the lame man in the Proverbs, whose legs were not equal, for his praying is shorter than his preaching.
poikilos 