First of all, we have to become brahmana. Then Vaisnava. Brahmana simply knows that "I am spirit soul," aham brahmasmi. Brahma janati iti brahmana. Brahma-bhutah prasannatma [Bg. 18.54]. By such knowledge one becomes prasannatma. Means relieved. As you feel relief... When there is burden on your head, and the burden is taken away you feel relieved, similarly, this ignorance that "I am this body" is a great burden, a burden upon us. So when you get out of this burden, then you feel relieved. Brahma-bhutah prasannatma [Bg. 18.54]. Means when actually one understands that "I am not this body; I am soul," then he has to work so hard for maintaining this body, so he gets relief that "Why I am working so hard for this lump of material things? Let me execute my real necessity of life, spiritual life." That is great relief.
Lecture on Bhagavad-gita 2.25, London, 28 August, 1973