तपोबीजप्रभावैस्तु ते गच्छन्ति युगे युगे । उत्कर्षं चापकर्षं च मनुष्येष्विह जन्मतः ॥ ४२ ॥
By the power of austerities and of the seed (from which they sprang), these (races) obtain here among men more exalted or lower rank in successive births.
english translation