Keep thy heart with all diligence— Above all keeping keep thy heart. Schultens. The life and death of the soul proceed from the heart: an upright, clear, enlightened, watchful heart gives life; a heart corrupted, dissipated, without knowledge, without wisdom, brings death: from the heart proceeds all evil. See Matthew 11:18-19. Guard it therefore most carefully; with all kind of diligence, and above all other cares: guard it from evil thoughts and evil desires: for if you have evil desires, it is impossible for you to refrain from evil actions. Your heart, corrupted as it is, will cause your destruction, if you do not employ all your care, in dependence on the blessing of God, to guard it well; to observe its motions, to regulate its inclinations, to repress its sallies.
Related Commentaries of Proverbs 4:23
Proverbs 4:23
23 Keep thy heart with all diligence; for out of it are the issues of life.