The fool hath said in his heart, There is no God. Psalm 14:1, 53:1Or if they trust their own hearts.
He that trusteth in his own heart is a fool. Proverbs 28:26Jesus often called people fools. (So it must be OK.)
Ye fools and blind. Matthew 23:17, 19And so did Paul.
Ye fools. Luke 11:40
O fools, and slow of heart to believe. Luke 24:25
Their foolish heart was darkened. Romans 1:21-22
Thou fool. 1 Corinthians 15:36
O foolish Galatians. Galatians 3:1
Whosoever shall say, Thou fool, shall be in danger of hell fire. Matthew 5:22