Christ is here preaching to the Jews. And his accusation is this: they have rejected him, they will not believe in him, and the very testimony that speaks of him, what Paul calls in Romans the Oracles of God, speaks of him.
But they cannot read this: they cannot listen, they are blinded by their idols.
He talks of John by way of illustration: John is not needed in the argument, for he argues that he says and does the will of God. That he is the law, and Moses is the commentary.
30“I can do nothing on my own. As I hear, I judge; and my judgment is just, because I seek to do not my own will but the will of him who sent me.
31“If I testify about myself, my testimony is not true. 32There is another who testifies on my behalf, and I know that his testimony to me is true. 33You sent messengers to John, and he testified to the truth. 34Not that I accept such human testimony, but I say these things so that you may be saved. 35He was a burning and shining lamp, and you were willing to rejoice for a while in his light. 36But I have a testimony greater than John’s. The works that the Father has given me to complete, the very works that I am doing, testify on my behalf that the Father has sent me. 37And the Father who sent me has himself testified on my behalf. You have never heard his voice or seen his form, 38and you do not have his word abiding in you, because you do not believe him whom he has sent.
39“You search the scriptures because you think that in them you have eternal life; and it is they that testify on my behalf. 40Yet you refuse to come to me to have life. 41I do not accept glory from human beings. 42But I know that you do not have the love of God in you. 43I have come in my Father’s name, and you do not accept me; if another comes in his own name, you will accept him. 44How can you believe when you accept glory from one another and do not seek the glory that comes from the one who alone is God? 45Do not think that I will accuse you before the Father; your accuser is Moses, on whom you have set your hope. 46If you believed Moses, you would believe me, for he wrote about me. 47But if you do not believe what he wrote, how will you believe what I say?”
It is not a bad thing to be a Jew. But it is not your salvation. Your salvation relies on Christ, and Christ alone: we have all sinned. None of us can attain the glory of God: we are broken.
There are religious Jews. They do, as did their forefathers, search the scripture. The Holy Spirit can and does use that scripture to bring them to Christ. And the most orthodox have to deal with the word, albeit with difficulty, for their traditions can blind them. From them there will be a remnant.
But those who reject Moses will be damned, for they reject God, and that makes them stupid. Our current ideologies, environmentalism, anti racism, multiculturalism and intersectionality do not lead to salvation.
Choose instead Christ. Love God, and be decent to your fellow fallen man. Love your brother in the Church as Christ is. And the rest is indeed commentary.