Ending Preliminary Processes

“In the Vaishnava parampara it is said that if one is engaged in the devotional service of Krishna, then there is no need for a spiritual process to understand the Supreme Absolute Truth. He has already come to the post because he is engaged in the devotional service of the Lord. He has ended all preliminary processes of understanding; similarly, if anyone, after speculating for hundreds of thousands of lives, does not come to the point that Krishna is the Supreme Personality of Godhead and that one has to surrender there, all his speculation for so many years and lives is a useless waste of time.” (Shrila Prabhupada, Bhagavad-gita, 15.19 Purport)