The example of Naradaji, that when he realized Krishna in his previous life, that life and next life, there is no difference. The example is given sometimes in the coconut skin when it is dried up, the fruit within the covering of coconut is hard. And if the coconut is shaken, it is found that the coconut fruit is moving within. Because it has dried up and broken away from the inner walls of the coconut skin. So it has nothing to do with the outer skin, even though it appears that it is within that skin. Similarly, when one is purely in Krishna Consciousness, it may appear that he is within the material existence, but actually he has nothing to do with it. He is dried up, like the coconut fruit; and that process of drying-up is forgetting all sense gratification, and executing Krishna Consciousness full time. So, when one is purely in Krishna Consciousness, his present life and in future life are identical.
Letter to Upendra, 1 June, 1968