Good News Translation
Someone may consider himself wise and let you know that he is certain about what he knows.

New Revised Standard Version
If a person is wise to his own advantage, the fruits of his good sense will be praiseworthy.

Contemporary English Version
If you see that certain people make wise choices themselves, you can depend on the advice they give to you.

New American Bible
When one is wise to his own advantage, the fruits of knowledge are seen in his own person.

Douay-Rheims Bible
A skilful man hath taught many, and is sweet to his own soul.

A skilful man hath taught many, and is sweet to his own soul.

Sirach 37:20
In all thy works let the true word go before thee, and steady counsel before every action.

Sirach 37:21
A wicked word shall change the heart: out of which four manner of things arise, good and evil, life and death: and the tongue is continually the ruler of them. There is a man that is subtle and a teacher of many, and yet is unprofitable to his own soul.

Sirach 37:23
He that speaketh sophistically, is hateful: he shall be destitute of every thing.

Sirach 37:24
Grace is not given him from the Lord: for he is deprived of all wisdom.