John 10:30 - Ellicott's Commentary On The Whole Bible

I and my Father are one. — The last clause of John 10:29 is identical with the last clause of John 10:28 if we identify “Father’s” with “My.” This our Lord now formally does. The last verses have told of power greater than all, and these words are an assertion that in the infinity of All-mighty Power the Son is one with the Father. They are more than this, for the Greek word for “one” is neuter, and the thought is not, therefore, of unity of person, but is of unity of essence. “The Son is of one substance with the Father.” In the plural “are” there is the assertion of distinctness as against Sabellianism, and in the “one” there is the assertion of co-ordination as against Arianism. At recurring periods in the history of exegesis men have tried to establish that these words do not imply more than unity of will between the Father and the Son. We have seen above that they assert both oneness of power and oneness of nature; but the best answer to all attempts to attach any meaning lower than that of the divinity of our Lord to these His words is found here, as in the parallel instance in John 8:58-59, in the conduct of the Jews themselves. To them the words conveyed but one meaning, and they sought to punish by stoning what seemed to them to be blasphemy. Their reason is here given in express words, “because that Thou, being a man, makest thyself God” (John 10:33).