There is treasure to be desired and oil in the dwelling of the wise; but a foolish man spends it up.
All Commentaries on Proverbs 21:20 Go To Proverbs 21
Augustine of Hippo
AD 430
So those who hear and out of carelessness forget, so to say swallow what they have heard, so that they no longer have a taste of it in their mouth but just bury what they hear under forgetfulness. But those who meditate on “the law of the Lord day and night” are chewing the cud, as it were, and enjoying the flavor of the word with a kind of palate of the heart.