By this shall all men know that you are my disciples, if you have love to one another.
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.
He who loves his brother continues in the light, and there is no occasion of stumbling in him.
But he who keeps his word, in him truly is the love of God perfected: by this we know that we are in him.
And now I appeal to you, lady, not as though I wrote a new commandment to you, but that which we had from the beginning, that we love one another.