John 6:62-65

⁶²Then what if you were to see the Son ascend to where he was before?

⁶³The Spirit gives life; the physical body doesn't do anything. The words I've told you are spirit and life!

⁶⁴Yet there are some of you who don't trust me.” (Jesus had known from the very beginning who didn't trust him, and who would betray him.)

⁶⁵Jesus added, “This is why I told you that no one can come to me unless it is made possible by the Father.”