On the whole, when the distressed, the inquisitive, the seekers of knowledge, and those who are in need of money are free from all material desires, and when they fully understand that material remuneration has nothing to do with spiritual improvement, they become pure devotees. As long as such a purified stage is not attained, devotees in transcendental service to the Lord are tainted with fruitive activities, and they search after mundane knowledge, etc. So one has to transcend all this before one can come to the stage of pure devotional service.

BG 7.16