Sirach 32:23

23 In every good work trust thy own soul; for this is the keeping of the commandments.

Sirach 32:23 In-Context

21 Be not confident in a plain way.
22 And beware of thine own children.
23 In every good work trust thy own soul; for this is the keeping of the commandments.
24 He that believeth in the Lord taketh heed to the commandment; and he that trusteth in him shall fare never the worse.

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