anukulyena Krishnanusilanam bhaktir uttama
“One should render transcendental loving service to the Supreme Lord Krishna favorably and without desire for material profit or gain through fruitive activities or philosophical speculation. That is called pure devotional service.” Unalloyed devotees have nothing to ask from the Supreme Personality of Godhead. Sometimes, when there is no alternative, a pure devotee, being fully dependent on the mercy of the Supreme Lord, prays for some benediction. But in such a prayer there is also regret. One who always hears and chants about the transcendental pastimes of the Lord is always situated on a platform on which he has nothing to ask in terms of material benefits.
Source: A.C. Bhaktivedanta Swami Prabhupada (2014 edition), “Srimad Bhagavatam”, Eighth Canto, Chapter 3 – Text 20 & 21