Coffman Commentaries on the Bible - Proverbs 13:12
"Delay in the accomplishment of some much-desired goal occasions sinking of the spirits and despondence; but, when the object of longing is obtained, it is a tree of life."[21] The mention here of "the tree of life" and in Proverbs 13:14 of "the fountain of life" supports the view that it is the longing for heaven which is the long-delayed joy of the godly person. This being true, we find a very important emphasis in Proverbs 13:13 upon the Word of God by which heaven is to be received by the... read more
E.W. Bullinger's Companion Bible Notes - Proverbs 13:12
deferred = protracted. maketh . . . sick = enfeebleth. Illustrations: Abraham (Genesis 15:2 , Genesis 15:3 ); David (Psalms 42:1-3 ); the Jews (Lamentations 4:17 ); the two disciples (Luke 24:17 , Luke 24:21 ). a tree of life. See Genesis 2:9 . read more