Luke 20:2

Authority? By what authority do you make yourself a teacher of the people, a censor of the priests, a reformer of the laws and customs? If Jesus Christ had not publicly given undeniable proofs of his mission, by his miracles, the Pharisees would have had a right to demand an answer to this question; but, after what had been done in their own sight, it was no longer excusable to oppose the preaching of the Son of God. (Calmet) --- Our Saviour himself teaches, that if he had not proved the divinity of his mission by his doctrine and works, it had been no sin to disbelieve or reject him. (John v. 31. and 36. and also x. 25, 37, and xv. 22, 24.