Matthew 9:4

And Jesus knowing their thoughts said, Wherefore think ye evil in your hearts?

And Jesus knowing their thoughts,.... Which was a clear evidence, and full demonstration of his deity; for none knows the thoughts of the heart but God; and since he knew the thoughts of men's hearts, it could be no blasphemy in him to take that to himself which belonged to God, even to forgive sins. And this, one would think, would have been sufficient to have approved himself to them as the true Messiah; since this is one of the ways of knowing the Messiah, according to the Jews, and which they made use of to discover a false one.

"Bar Coziba, (they say {g},) reigned two years and a half: he said to the Rabbins, I am the Messiah; they replied to him, it is written of the Messiah, that he is "of quick understanding, and judges", (referring to Isaiah 11:3) let us see whether this man is of quick understanding, and can make judgment, i.e. whether a man is wicked, or not, without any external proof; and when they saw he was not of quick understanding, and could not judge in this manner, they slew him.''

But now Christ needed not any testimony of men; he knew what was in the hearts of men, of which this instance is a glaring proof: hence he said,

Wherefore think ye evil in your hearts? it was no evil in them to think that God only could forgive sin; but the evil was, that they thought Christ was a mere man, and ought not to have took so much upon him; and that, for so doing, he was a wicked man, and a blasphemer.

{g} T. Bab. Sanhedrim, fol. 93. 2.