one what??? Where does it say there the they are "one person". Note that it does not read "I and the Father AM one". If he was the Father, why didn't he say so with the simple words: "I am the Father" --- but he didn't because he wasn't and isn't.
This same thing is stated by Paul in I Corinthians 3:6-8:
"I have planted, Apollos watered, but God gave the increase... Now he that planted and he that watereth are one".
Is Paul saying that he and Apollos are the same person? Certainly not. It means that they are united in agreement but with different ministries. They complement one another rather than conflict or compete with each other.
And then Jesus prays for his apostles "that they may be one even as we are one". Well, hello. Did John become Peter who became James .... Weren't they all different people with different identities and different ministries and different callings and different destinies??? But they became ONE just as the Father and the Son and the Holy Spirit were ONE --- united in agreement and purpose regarding the Gospel but with separate identities, separate names, separate ministries.
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."