John 10:37-38
“If I do not the works of My Father, believe Me not; but if I do, though ye believe not Me, believe the works.”
Do you see how He proves what I said, that He is in nothing inferior to the Father, but in every way equal to Him? For since it was impossible to see His Essence, from the equality and sameness of the works He affords a proof of unvaryingness as to Power. And what, tell me, shall we believe?
3. “That I am in the Father, and the Father in Me.”
“For I am nothing other than what the Father is, yet still Son; He nothing other than what I am, yet still Father. And if any man know Me, he knows the Father, and if he knows the Father, he has learned also the Son.” Now were the power inferior, then also what relates to the knowledge would be false, for it is not possible to become acquainted with one substance or power by means of another.
Source: Homilies on the Gospel of John (New Advent)