Krishna is not ungrateful but rather He sees all our efforts and appreciates our sincere service. Krishna is interested in how we engage our energies in His service. We are very small, very insignificant, so what can we do? Simply He wants to see that we are engaging our time and energy in His service. And you always remember to abide by the laws of Krishna as described by His bona fide Representative, and the passage of going back to Godhead is assured. This is Krishna's Mercy.
Letter to Devananda, 23 November, 1968