Beyond all that knowledge lies the superior knowledge of Krishna. This knowledge is revealed within the heart by the mercy of the Lord. The more that you think of Him, hear about Him, pray to Him, and worship Him, the more He will reveal this knowledge to you from within. Real renunciation will grow, even while you remain in school. Then Krishna will perfectly arrange everything required for your further progress in His devotional service. You must have firm faith that He knows what is best and that He will arrange it.
(Collected Letters to My Disciples, Pg 153, 2nd Paragraph)