New Defender's Study Bible Notes
12:20 Thou fool. Those who lay up treasure for themselves and are not rich toward God (Luke 12:21) are insane fools in God’s omniscient judgment. Jesus warned against our calling someone a fool (Greek moros, meaning “stupid”), but He used even a stronger word here (Greek aphron, meaning “insane one;” the word is closely related to the word for “foaming,” aphros). This is, therefore, a very serious and sober warning against self-centered covetousness.