As far as the results of one's good karma is concerned, good karma returns in that he is surrendering to Krsna. One comes to the point of surrender when one has actually amassed the result of multi pious activities. This is stated in the Caitanya Caritamrta as quoted from the Srimad-Bhagavatam (SB 10.12.11).
Letter to Acyutananda Maharaja, 1 November, 1973