(29) But I know him.--In contrast with their ignorance is His own full knowledge, which belonged to One only. (See Note on John 1:18.) The pronoun "I" here, as "ye" immediately before, is emphatic.

For I am from him, and he hath sent me.--This knowledge is here based upon His oneness of essence, and upon His true mission. He knows God because He is from Him, and in union ever one with Him. He knows God because He is in His human nature the representative of the Divine to mankind.

Verse 29. - (But) I know him; because I am from him - my inmost nature, the centre of my ego, proceeds, is derived, from him. I have come forth from him. There is that about me and my origin which has brought me into such intimate relations with the Father that I know him as ye do not know him (cf. John 8:55) - and he (whom I thus know, and to whom I refer, ἐκεῖνος) sent me. This sending is a further condition of the knowledge which you fail to appreciate, but which would make all things plain to you. If this knowledge should break as the daystar on their darkness, would they not at once see that, up to that point at least, in their experience they did not know, or had not known, whence he was, in the grandest sense. The charge of ignorance and the claim of supernatural knowledge, Divine origin, Divine commission, was too much for these Jerusalemites. They thought it blasphemy.

7:25-30 Christ proclaimed aloud, that they were in error in their thoughts about his origin. He was sent of God, who showed himself true to his promises. This declaration, that they knew not God, with his claim to peculiar knowledge, provoked the hearers; and they sought to take him, but God can tie men's hands, though he does not turn their hearts.But I know him,.... His nature and perfections, his purposes and promises, his council and covenant, his mind and will; and indeed none knows him but he, and those to whom he pleases to reveal him; and there is good reason why he should have intimate and perfect knowledge of him:

for I am from him; being the only begotten of him, and as such lay in his bosom, and knew him, and his whole heart, and was privy to all of him, and that that is within him;

and he hath sent me; in an office capacity to redeem his people. This is the original descent of Christ, which the Jews knew not, though they pretended to know him, and whence he was.