Isaiah 45:6
I am the Lord and there is none else. (Nothing besides God exists)
John 17:21
That they all may be one; as thou, Father, art in me, and I in thee, that they also may be one in us: that the world may believe that thou hast sent me. (One and the same as, numerical singularity)
Galations 5:14
For all the law is fulfilled in one word, even in this; Thou shalt love thy neighbour as thyself. (Your neighbor IS yourself)
The Holy Spirit will confirm the above.
Moroni 10:4
if ye shall ask with a sincere heart, with real intent, having faith in Christ, he will manifest the truth of it unto you, by the power of the Holy Ghost.
Because I have directly experienced this singularity (mystical union with God) hundreds of times, I am pretty sure that my interpretation of the above verses can not be incorrect.
By "union with God" I mean the case when one's will and God's will become one-and-the-same. It is in this sense that I refer to numerical singularity. I am not saying that human individuality will ever cease to be.