Arthur W. Pink (1945) writes,
“I and my Father are one” (10:30). The R.V. correctly renders this verse, “I and the Father are one.” The difference between these two translations is an important one. Wherever the Lord Jesus says, “my Father,” He is speaking as the Mediator, but whenever He refers to “the Father,” He speaks from the standpoint of His absolute Deity. Thus, “my Father is greater than I” (John 14:28 ) contemplates Him in the position of inferiority. “I and the Father are one” affirms Their unity of nature or essence, one in every Divine perfection.
Before I go back to what “one” implies in part 4, I need to explore with you the “my” and “the”. Would you accept Father and Son as equal in power?