Well I'm glad that man was humble and teachable enough to change his mind on that last statement. More than we see with most, who only keep getting worse instead of learning and growing in the right direction.
Isa 43:10
Ye are my witnesses, saith the LORD, and my servant whom I have chosen: that ye may know and believe me, and understand that I am he: before me there was no God formed, neither shall there be after me.
His point that he was making with the term "mingling" seems to have been that we are not annihilated as a being and person when God comes to dwell in us by His Spirit. (It's possible also that some nuance got lost in translating the Chinese word into the English, I don't know.) And it’s possible he might have been trying to correct a mistaken belief that was trying to spring up…people can so easily get hold of the wrong end of the stick on things, even leading to cults, and the devil is always attempting to deceive and do damage.
There are times when it can be hard to know where "I" begin and end when the Lord is manifesting a work through our vessel or in prayer. We can sort of lose sight of ourselves in being taken up into God, which is a good thing……….but we don’t seem to lose our awareness in general in being aware of God and what He is doing or saying, and experiencing the joy of blessing in His presence. “I have been crucified with Christ” is in an allegorical sense I believe, rather than literal. Our source of life is no longer in our mortal carnal spiritually dead “selves”, but in Jesus, in His Spirit…partaking of His spiritual, immortal, eternal life.
Phl 2:13
For it is God which worketh in you both to will and to do of his good pleasure.
Gal 2:20
“I have been crucified with Christ; it is no longer I who live, but Christ lives in me; and the life which I now live in the flesh I live by faith in the Son of God, who loved me and gave Himself for me.
1Co 6:16-17
What? know ye not that he which is joined to an harlot is one body? for two, saith he, shall be one flesh.
But he that is joined unto the Lord is one spirit.
The allegory of union of a man and woman joins them as one, but they are still two people. I think there is a mystery to our union with Christ similar to the mystery of the Three being one. But for me, I avoid getting into actual arguing about things like this because they are hard for anyone to grasp, and can be unnecessarily divisive.
And sorry to be long winded, but just one last point that comes to mind.....I think it's fine to use our own words and allegories in trying to help others understand something, but I believe we can go off track or miss the mark if we start to overuse and rely on our own words and allegories rather than the words and allegories that we have been given in scripture.