By this shall all men know that ye are my disciples, if ye have love one to another.

So we, being many, are one body in Christ, and every one members one of another.

And he came to Capernaum: and being in the house he asked them, What was it that ye disputed among yourselves by the way?
But they held their peace: for by the way they had disputed among themselves, who should be the greatest.
And he sat down, and called the twelve, and saith unto them, If any man desire to be first, the same shall be last of all, and servant of all.

COMMENTARY

By this shall all men know that ye are my disciples, if ye have love one to another
So we, being many, are one body in Christ
I believe Christians sometimes believe that the body of Christ refers to their particular sect only, and not to any of the others. But why can it not be referring to all Christians?
Christ, himself, gave the definition for being one of his followers, and he did not say it was by being only a Catholic, or only a Lutheran, or only a Mormon. He said “men know that ye are my disciples, if ye have love one to another.” So if I have love for a Methodist and a Jehovah’s Witness, then what am I? A disciple of Christ. And if a Protestant and a Presbyterian have love for me, then what are they? Disciples of Christ. And if we do not have love for one another, then what are we? Not disciples.

They had disputed among themselves, who should be the greatest
And he saith unto them, If any man desire to be first, the same shall be last of all
I believe many Christians also have a mistaken fantasy that when Christ comes again he will point to their church and say “This. This was the right one, and all the rest of you are wrong.” In essence, we, like the disciples of old, are hoping that Jesus will choose us as the greatest above all others. But Jesus cautions us that desires to be the greatest debase us to the lowest.
Let us suppose that your own religion teaches the absolute truth and mine is somewhat amiss. Yes, when Jesus comes He would need to then correct all of the misconceptions that I hold. But I am certain that he would not do this by wagging his finger and telling me just how wrong I am. Rather he would accept that I am striving for rightness, and lovingly show me how to be even more so.
It would be like a servant washing the feet of the disciples that still have a little dirt on them.