The bible was re-written several times, by copying and translating. It has also gone through series of editing by early Church elders.
I believe that Christ saw the spiritual realm quite well. He saw how he and us are related to God. It is something very profound, grand and too good even for religious institutions believe. I do not wish to expand this here.
In short, I believe the true meaning is that what you do to others, you also do that to you. Jesus saw that all our souls, which act independently, are linked and not separate. When God or Jesus or any spiritual masters looks into your eyes they will also see each of your neighbor within you.
It is no wonder that Jesus proclaimed the you should love your neighbor as you love yourself. In other words be prepared, what you do to others, good or bad, it will come back to you.
Even your judgement against others, which is not advised, will come back to you.
This was the grandest message of Jesus which echos itself many times over.