Are we blind also? - These Pharisees understood Christ as speaking of blindness in a spiritual sense, and wished to know if he considered them in that state.
Matthew Henry
Concise Bible Commentary
Christ came into the world to give sight to those who were spiritually blind. Also, that those who see might be made blind; that those who have a high conceit of their own wisdom, might be sealed up in ignorance. The preaching of the cross was thought to be folly by such as by carnal wisdom knew not God. Nothing fortifies men's corrupt hearts against the convictions of the word, more than the high opinion which others have of them; as if all that gained applause with men, must obtain acceptance with God. Christ silenced them. But the sin of the self-conceited and self-confident remains; they reject the gospel of grace, therefore the guilt of their sin remains unpardoned, and the power of their sin remains unbroken.
SDA Bible Commentary (limited)
Volume 1-7
40. Are we blind also? The Greek construction anticipates a negative answer. The emphasis is upon the “we.” Surely we, the religious leaders, are not blind! This was not a humble, anxious inquiry. The Pharisees doubtless saw the implication of the Lord’s statement, and their words were uttered in scorn.