This is not a verse that I’ve seen feature heavily in Trinitarian debates but it seems to me it presents a problem for the Trinity. If there are any around I’d be interested to know your perspective, or anything you can find on the meaning and how it doesn’t contradict the Trinity.
The verse says:
So Jesus said to them, “When you have lifted up the Son of Man, then you will know that I am he, and that I do nothing on my own authority, but speak just as the Father taught me.
As far as I know there are no major textual or translation issues, so the verse is straightforward in that sense.
What strikes me is the final phrase: “just as the Father taught me”. JWs believe that Jesus is God’s first creation and that God taught his Son everything over billions of years in his prehuman life. When do Trinitarians think that God taught his Son?
One commentary makes the statement:
but as my Father hath taught me, I speak these things; this he says not as lessening himself, or making himself inferior to the Father, but to show the excellency of his doctrine, and to assert the original, authority, and divinity of it; suggesting that it was not an human doctrine, or a device of man's, or his own, as man, but was divine, and from God
But the impression of the verse is that the Father is superior in knowledge and wisdom compared with the Son and that he taught the Son everything. So this commentary seems to raise the problem with the verse for the Trinity without offering a solution.