Jesus gave the gift of oneness that the Father gave Him. That we may be one as they are one. Jesus in us and the Father in Him. This is in the NT and is not hidden from you.What is the oneness Jesus taught? I do not remember reading it?
And the context is oneness not what was given. For in Christ all the fullness of God was pleased to dwell. From the will of another. God was also pleased through him to reconcile to himself all things, whether things on earth or things in heaven, by making peace through his blood, shed on the cross.
Don’t you believe that I am in the Father, and that the Father is in me? The words I say to you I do not speak on my own authority. Rather, it is the Father, living in me, who is doing his work.
In the past God spoke to our ancestors through the prophets at many times and in various ways, 2 but in these last days he has spoken to us by his Son
So we are in Christ and He is in us and the Father is in Him and He is in the Father. Oneness in the same manner.