Commentators unanimously point to Nabal's drunkenness as a clear sign of his foolishness, with Matthew Henry noting it's a sure way to destroy what little wisdom one has. His feast, described as 'like the feast of a king,' and his drunken state show a man who abuses abundance, oblivious to the mortal danger he is in. This serves as a warning about the deceitfulness of worldly pleasures and how excess can blind us to reality.