Albert Barnes Commentary John 10:38

"But if I do them, though ye believe not me, believe the works: that ye may know and understand that the Father is in me, and I in the Father." — John 10:38 (ASV)

Believe the works. Though you do not credit me, yet consider my works, for they prove that I came from God. No one could do them unless he was sent of God.

Father is in me, and so forth. Most intimately connected. See John 5:36. This expression denotes most intimate union—such as can exist in no other case. See Matthew 11:27. See Barnes on John 17:21.