“And so when the Lord said, This is my commandment, that you love one another, he added immediately, just as I have loved you.
He means that we must love for the same reason he has loved us. My friends, when the devils draws us to take pleasure in passing things, he also stirs up a weak neighbor against us. This neighbor may plot to take away the very things we love. In this case, our enemy is not concerned with doing away with our earthly possessions; he wants to destroy our love. We may suddenly begin to burn with hatred, and while we try to be outwardly invulnerable, inwardly we are gravely wounded. As we defend our few external possessions we lose our great interior one, because when we love something passing we lose true love. Anyone who takes away one of our external possessions is an enemy; if we begin to hate this enemy, our loss is not of anything external, but of something insides ourselves. And so whenever we suffer anything from a neighbor, we must be on our guard against the enemy hidden within. Our best way of overcoming this inner enemy is to love the one who is attacking us from without. The unique and supreme proof of love is this: to love a person who opposes us.
That is why Truth himself bore the suffering of the cross, and even bestowed his love on his persecutors. He said, Father, forgive them for they know not what they do. Should we marvel that his living disciples love their enemies when their dying Master loved his? He expressed the extent of his love when he said that no one has greater love than this, to lay down his life for his friends. The Lord had come to die even for his enemies. He said that he would lay down his life for his friends to show us that we are able to win over our enemies by our love for them, then even our persecutors are our friends. But no one is persecuting us to the point of death, and so how can we prove that we love our friends? In fact there is something we ought to do during times of peace to make clear whether we are strong enough to die for the sake of love during a time of persecution. John, the author of the gospel I have been quoting from, says in his first letter: Those who have this world’s goods and see a brother or sister in need, and who close their hearts, how does God’s love dwell in them? And John the Baptist says: Let one who has two coats give to one who has none. Will those who refuse to give up a coat for the sake of God during a time of peace give up their lives during a persecution?
You must cultivate the virtue of love during times of tranquility by showing mercy, and then your love will be unconquerable in a time of chaos. First you must learn to give up your possessions for almighty God, and then yourself. You are my friends… How great is our Creator’s mercy! We were unworthy servants, and he calls us friends! How great is our human dignity, that we should be friends of God! Now listen to what this dignity costs: if you do what I command you. And we have already heard that this is my commandment, that you love one another.” (Spiritual Readings from St. Gregory the Great, Be Friends of God, pp 48-50)