A class on Srimad Bhagavatam 1.2.19 given by His Divine Grace A.C. Bhaktivedanta Swami Prabhupada on October 30, 1972 in Vrindavan, India.
A transcript of the class can be found here: https://goo.gl/AY7XbL.
Srimad Bhagavatam 1.2.19
tadā rajas-tamo-bhāvāḥ
kāma-lobhādayaś ca ye
ceta etair anāviddhaṁ
sthitaṁ sattve prasīdati
As soon as irrevocable loving service is established in the heart, the effects of nature’s modes of passion and ignorance, such as lust, desire and hankering, disappear from the heart. Then the devotee is established in goodness, and he becomes completely happy.