So far crying for Krishna is concerned, it is very nicely explained by Lord Caitanya. He says that a moment is appearing to me as 12 years, and my eyes are tearing torrents of rain, and I am feeling everything vacant in the absence of Govinda. The thing is that as we go on chanting Hare Krishna, in the pure status, we shall be on the loving platform and at that time, we shall feel the greatest separation from the Lord; but that feeling of separation from the Lord is more relishable than meeting the Lord. These are all transcendental existential understandings and as we grow in Krishna Consciousness, we understand everything, gradually, by the Grace of the Supreme Lord. The Supreme Lord is situated in everyone's heart, and He reveals Himself to the devotee with the progress of Krishna Consciousness. Thank you very much for your writing me.
Letter to Makhanlal, 21 October, 1968