Don't manufacture preaching. Preach as it is in the sastra. That is Caitanya Mahaprabhu's instruction: yare dekha tare kaha 'krsna'-upadesa [Cc. Madhya 7.128]. You do not become a rascal guru yourself by manufacturing some imagination. This rascaldom don't do. One thing do. What is that? What is said by Krsna, you say. That's all. What is the difficulty? What Krsna has said, you say.
Srila Prabhupada — July 20, 1976, New York