Note to The Merchant of Venice, 1.1.99 "would call their brothers fools"

The Merchant of Venice,
Act 1, Scene 1, line 99.

would call their brothers fools: would speak such nonsense that those who heard them would immediately call them fools and so risk damnation. The allusion is to Matthew 5:22: "And whosoever saith unto his brother, ... Fool, shall be worthy to be punished with hell fire" (Geneva).