John Calvin on John 10:30

30. I and my Father are one. He intended to meet the jeers of the wicked; for they might allege that the power of God did not at all belong to him, so that he could promise to his disciples that it would assuredly protect them. He therefore testifies that his affairs are so closely united to those of the Father, that the Father’s assistance will never be withheld from himself and his sheep The ancients made a wrong use of this passage to prove that Christ is (ὁμοούσιος) of the same essence with the Father. For Christ does not argue about the unity of substance, but about the agreement which he has with the Father, so that whatever is done by Christ will be confirmed by the power of his Father.

John 10:31-36

31. Then the Jews again took up stones to stone him. 32. Jesus answered them, Many good works I have shown you from my Father. For which of those works do you stone me? 33. The Jews answered him, We stone thee not for the sake of a good work, but for blasphemy, and, because thou, being a man, makest thyself God. 34. Jesus answered them, Is it not written in your Law, I said, You are gods? 35. If it called them gods, to whom the word of God was addressed, and Scripture cannot, be broken, 36. Do you say that I, whom the Father sanctified and sent into the world, blaspheme, because I said, I am the Son of God?