en_tn/pro/21/11.md

the naive

"those who have no experience" or "those who are not mature"

the mocker

"the person who mocks others"

when the wise person is instructed

This can be translated in active form. Alternate translation: "when someone instructs the wise person" (See: rc://en/ta/man/jit/figs-activepassive)

lays hold of knowledge

Here knowledge is spoken of as if it were an object that someone could grasp and keep for himself. (See: rc://en/ta/man/jit/figs-metaphor)