George Muller, The Autobiography of George Muller, 1984, p. 32-33.
The Lord always helps me when I preach; provided I have earnestly sought Him in private… My chief help is prayer. Whenever I study a single part of divine truth, I always gain some light about it after praying and meditating over it. Extensive prayer is often difficult because of the weakness of the flesh, physical infirmities, and a full schedule. But no one should expect to see much good resulting from his labors if he does not spend time in prayer and meditation.
George Muller, The Autobiography of George Muller, 1984, p. 32-33.