Let's read the context. It is during Hanukkah and Jesus is at the temple and the Jews are congregating around him....hoping he'll slip up. [John 10:22-24]
He tells them in so many words he indeed is the Son of God and they attempt to stone him. [John 10:25-31]
They are attempting this because He claims to be God. Jesus answers that indeed it is written that "Ye are Gods"[Psalm 82:6] and scripture cannot be broken. He asks why they accuse him of blasphemy because he claims to be God's Son. [John 10:32-37]
If Jesus was not God incarnate then his sacrifice would have been for naught [Psalm 49:5-9]....but He was [John 1:1] ....And the Word was God.
One what? One God.
[John 10:38] "But if I do it, even though you do not believe me, believe the miracles, that you may know and understand that the Father is in me, and I in the Father."
Right --- He said that He was the SON of God. Did these Jews ever say: "What do you mean by the word 'Son' of God? God doesn't have a Son. There is only one person up there". No --- They never question him in regard to there being a Father and a Son.
As a matter of fact, even the parables that Jesus told indicate that the Jewish leaders understood that the Father and the Son were two separate persons. They had no problem with the concept. They just didn't like this Son that they had in front of them. He wasn't who they expected.
Jesus and the Father were ONE just like the apostles were ONE and Paul and Apollos were ONE. Just as the apostles were more than one person and Paul and Apollos were more than one person, so Jesus and his Father.
In the beginning was the Word, and the Word was with God