Now when he was in Jerusalem at the Passover, during the feast, many believed in his name, observing his signs which he did.
      IV. That the reason why he did not commit himself to them was because he knew them (John 2:25; John 2:25), knew the wickedness of some and the weakness of others. The evangelist takes this occasion to assert Christ's omniscience. 1. He knew all men, not only their names and faces, as it is possible for us to know many, but their nature, dispositions, affections, designs, as we do not know any man, scarcely ourselves. He knows all men, for his powerful hand made them all, his piercing eye sees them all, sees into them. He knows his subtle enemies, and all their secret projects; his false friends, and their true characters; what they really are, whatever they pretend to be. He knows them that are truly his, knows their integrity, and knows their infirmity too. He knows their frame. 2. He needed not that any should testify of man. His knowledge was not by information from others, but by his own infallible intuition. It is the infelicity of earthly princes that they must see with other men's eyes, and hear with other men's ears, and take things as they are represented to them; but Christ goes purely upon his own knowledge. Angels are his messengers, but not his spies, for his own eyes run to and fro through the earth,2 Chronicles 16:9. This may comfort us in reference to Satan's accusations, that Christ will not take men's characters from him. 3. He knew what was in man; in particular persons, in the nature and race of man. We know what is done by men; Christ knows what is in them, tries the heart and the reins. This is the prerogative of that essential eternal Word, Hebrews 4:12; Hebrews 4:13. We invade his prerogative if we presume to judge men's hearts. How fit is Christ to be the Saviour of men, very fit to be the physician, who has such a perfect knowledge of the patient's state and case, temper and distemper; knows what is in him! How fit also to be the Judge of all! For the judgment of him who knows all men, all in men, must needs be according to truth.