18.5 Yajna-dana-tapah-karma, the practice of sacrifice, charity and austerity-this threefold practice; na tyajyam, is not to be abandoned; tat, it; is eva, surely; karyam, to be undertaken. Why? Yajnah, sacrifice; danam, charity; and tapah, austerity; are eva, verily; pavanani, the purifiers, the causes of sanctification; manisinam, of the wise, i.e. of those who do not seek results for themselves.