I have'nt read that.
But i can quote from the scriptures.
Srimad Bhagavatam 1.18.18:
Śrī Sūta Gosvāmī said: O God, although we are born in a mixed caste, we are still promoted in birthright simply by serving and following the great who are advanced in knowledge. Even by conversing with such great souls, one can without delay cleanse oneself of all ...