Adam Clarke on Proverbs 13:14

The law of the wise is a fountain of life - Perhaps it would be better to translate, "The law is to the wise man a fountain of life." It is the same to him as the "vein of lives," מקור חיים mekor chaiyim, the great aorta which transmits the blood from the heart to every part of the body. There seems to be here an allusion to the garden of paradise, to the tree of lives, to the tempter, to the baleful issue of that temptation, and to the death entailed on man by his unwisely breaking the law of his God.