I am very glad to learn that you are doing spiritual activities very nicely and you are always alert to see whether you are committing some offense. This is a very nice attitude. In rendering service to Lord Krsna and His representative the Spiritual Master, we should always maintain this fearful attitude which means careful attention. This attitude will advance you progressively in Krishna Consciousness.

From Srila Prabhupada’s letter to Gopala Krsna — Los Angeles 21 April, 1970