From your letter I can understand that you are advancing very nicely in Krishna Consciousness. You are correct in your estimation that all activities, even so-called frustrations, become a great joy when is working for Krishna. This is the clue to successful work which is revealed in Bhagavad-gita, that we should concern ourselves only with giving everything to Krishna and all the frustrations of sinful reactions will be no more.
Letter to Hrsikesa, 26 November, 1968