This is not a concern of Gnosticism (which IS CRAZY!)
Yep, Gnostics do not believe Christ was here on earth in the flesh and blood body. They got the thought that how could he be! Disgusting, no flesh can please God ever, is the thought that has stuck with them in their religion. And so there was division in the gathering of the people back then. So the person I. charge, (Pastor) wrote a letter to John on the Island of Patmos then, to get this straightened out.
That is why we see in 1 John, this letter response to that pastor of that gathering of people fighting over truth
So, John wrote
1 John 1
Authorized (King James) Version
1 That which was from the beginning, which we have heard, which we have seen with our eyes, which we have looked upon, and our hands have handled, of the Word of life; 2 (for the life was manifested, and we have seen
it, and bear witness, and shew unto you that eternal life, which was with the Father, and was manifested unto us
3 that which we have seen and heard declare we unto you, that ye also may have fellowship with us: and truly our fellowship
is with the Father, and with his Son Jesus Christ. 4 And these things write we unto you, that your joy may be full.
Right there John replies we have seen we have tasted, we have touched this life in flesh and blood.
Then going further into the letter back to them them then, we come across (The Christian bar of soap) You must continue to repent daily or you not saved, inn other words it has gotten interpreted I am not saved if I sin again, not seeing why I am sinning again. Not seeing the truth in being 100% forgiven by God through Son for us to be reconciled. (2 Cor 5:17-20)
Okay, so the camp camps out on 1 John 1:9 and does not see 1 John 2:1-4, and verse 12, those verses in between is how one responds to 'God in thanksgiving and praise since all sin today now in Son is taken out of the way for us to do right in his doing done work of
Son for us, not of the self effort at all, at least for me to see this has been a long walk off a short pier for me here on earth.