We are asked not to find a neighbor but to become a neighbor. This is not only a moral question, a question of behavior, a question of earthly help. It is properly speaking a theological question. The criterion for our faith in God is participation in God's love. God in Himself loves person to person to person, to such perfection that the Three Persons in God are one being.
Love is the criterion of discipleship.
By this shall all know that you are my disciples, that you have love one for another. It is new because it is a progress from Old Testament love, which had to forge tribal unity. In the Old Testament enemies were massacred with the blessing of God. But Christ came and taught universal love of all my fellow men, even my enemies. The Christian way is to deny ourselves, to die to ourselves, so that can love our neighbor.