New Revised Standard Version
So they answered Jesus, “We do not know.” And he said to them, “Neither will I tell you by what authority I am doing these things.

Contemporary English Version
So they told Jesus, "We don't know." Jesus said, "Then I won't tell you who gave me the right to do what I do."

New American Bible
So they said to Jesus in reply, “We do not know.” He himself said to them, “Neither shall I tell you by what authority I do these things.

Douay-Rheims Bible
And answering Jesus, they said: We know not. He also said to them: Neither do I tell you by what authority I do these things.

And answering Jesus, they said: We know not. He also said to them: Neither do I tell you by what authority I do these things.

We cannot tell.

Matthew 15:14 Let them alone: they are blind, and leaders of the blind. And if the blind lead the blind, both fall into the pit.

Matthew 16:3 And in the morning: To day there will be a storm, for the sky is red and lowering. You know then how to discern the face of the sky: and can you not know the signs of the times?

Matthew 23:16 Woe to you, blind guides, that say, Whosoever shall swear by the temple, it is nothing; but he that shall swear by the gold of the temple is a debtor.

*etc:

Isaiah 6:10 Blind the heart of this people, and make their ears heavy, and shut their eyes: lest they see with their eyes, and hear with their ears, and understand with their heart, and be converted and I heal them.

Isaiah 28:9 Whom shall he teach knowledge? and whom shall he make to understand the hearing? them that are weaned from the milk, that are drawn away from the breasts.

Isaiah 29:10-12 For the Lord hath mingled for you the spirit of a deep sleep, he will shut up your eyes, he will cover your prophets and princes, that see visions. . . .

Isaiah 42:19,20 Who is blind, but my servant? or deaf, but he to whom I have sent my messengers? Who is blind, but he that is sold? or who is blind, but the servant of the Lord? . . .

Isaiah 56:10,11 His watchmen are all blind, they are all ignorant: dumb dogs not able to bark, seeing vain things, sleeping and loving dreams. . . .

Jeremiah 8:7-9 The kite in the air hath known her time: the turtle, and the swallow, and the stork have observed the time of their coming: but my people have not known the judgment of the Lord. . . .

Malachi 2:6-9 The law of truth was in his mouth, and iniquity was not found in his lips: he walked with me in peace, and in equity, and turned many away from iniquity. . . .

Luke 20:7,8 And they answered that they knew not whence it was. . . .

John 9:30,40,41 The man answered and said to them: why, herein is a wonderful thing, that you know not from whence he is, and he hath opened my eyes. . . .

Romans 1:18-22,28 For the wrath of God is revealed from heaven against all ungodliness and injustice of those men that detain the truth of God in injustice: . . .

2 Corinthians 4:3 And if our gospel be also hid, it is hid to them that are lost,

2 Thessalonians 2:9,10 Whose coming is according to the working of Satan, in all power and signs and lying wonders: . . .