Confusing verses in John, Pt.I

Chapter 10:

33 The Jews answered him, “It is not for a good work that we are going to stone you but for blasphemy, because you, being a man, make yourself God.” 34 Jesus answered them, “Is it not written in your Law, ‘I said, you are gods’? 35 If he called them gods to whom the word of God came—and Scripture cannot be broken— 36 do you say of him whom the Father consecrated and sent into the world, ‘You are blaspheming,’ because I said, ‘I am the Son of God’? 37  If I am not doing the works of my Father, then do not believe me; 38 but if I do them, even though you do not believe me, believe the works, that you may know and understand that the Father is in me and I am in the Father.”

One can extract the following theological truths from the passage:

• The reference is Psalm 82:6, where the judges of God were called elohim (literally “god”) because of their divine function. Jesus is using the analogy to show he is the ultimate judge because his works are directly reflecting the Father’s will. In layman’s terms: “Don’t hate cuz I say I’m the son of God. Check dem credenshals.”
• This shows that any part of the Old Testament has the same authority as the traditional “law” as per the Pentateuch definition. Jesus pins his entire argument on one word in one minor psalm.
• The trinity relationship has each part of the Godhead “in” each other. Not simply “one” (Greek neuter) in purpose but one in essence and fullness of divine nature; aka Christianity is monotheistic. If one more Jehovah’s Witness comes to my door..