न तेन वृद्धो भवति येनास्य पलितं शिरः । यो वै युवाऽप्यधीयानस्तं देवाः स्थविरं विदुः ॥ १५६ ॥
A man is not therefore (considered) venerable because his head is gray; him who, though young, has learned the Veda, the gods consider to be venerable.
As a eunuch is unproductive with women, as a cow with a cow is unprolific, and as a gift made to an ignorant man yields no reward, even so is a Brahmana useless, who (does) not (know) the Rikas.
Created beings must be instructed in (what concerns) their welfare without giving them pain, and sweet and gentle speech must be used by (a teacher) who desires (to abide by) the sacred law.