Knowledge is partial, because our intellect is an instrument, it is only a part of us, it can give us information about things which can be divided and analysed, and whose properties can be classified part by part. But Brahma is perfect, and knowledge which is partial can never be a knowledge of him.

Not by birth does one become an outcaste, not by birth does one become a brahman. By one's action one becomes an outcaste, by one's action one becomes a brahman.