Keep thy heart with all diligence; for out of it are the issues of life.
Proverbs 4:23
King James Version (public domain)
Traditionally attributed to Solomon · c. 10th century BC · King of Israel, renowned for wisdom
Context
21Let them not depart from thine eyes; keep them in the midst of thine heart.
22For they are life unto those that find them, and health to all their flesh.
23Keep thy heart with all diligence; for out of it are the issues of life.
24Put away from thee a froward mouth, and perverse lips put far from thee.
25Let thine eyes look right on, and let thine eyelids look straight before thee.