Thy heart; thy mind and thoughts, and especially the will and affections, which are the more immediate and effectual cause of all men's actions. Out of it are the issues of life; from thence proceed all the actions, as of the natural, so of the spiritual life, which lead to eternal life and happiness; as, on the contrary, all evil actions tending to death spring from thence, which is here implied.
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.