"The pure devotees always serve Krsna with great love and affection, for He is the Supreme Personality of Godhead, the Supersoul of every living entity. It is concluded therefore that even a little energy expended in the service of the Lord gives one immense transcendental profit. This is explained in the Bhagavad-gita: svalpam apy asya dharmasya. Devotional service in Krsna consciousness is so sublime that even a little service to Krsna, knowingly or unknowingly, gives one the greatest benefit."
(KRSNA, the Supreme Personality of Godhead, Ch. 6)