Sirach 4:24

24 For by speech wisdom shall be known: and learning by the word of the tongue.

Sirach 4:24 In-Context

22 Accept no person against thy soul, and let not the reverence of any man cause thee to fall.
23 And refrain not to speak, when there is occasion to do good, and hide not thy wisdom in her beauty.
24 For by speech wisdom shall be known: and learning by the word of the tongue.
25 In no wise speak against the truth; but be abashed of the error of thine ignorance.
26 Be not ashamed to confess thy sins; and force not the course of the river.

The Brenton translation of the Septuagint is in the public domain.