After the Israelites safely crossed the Red Sea, the Egyptians chased after them and were drowned. God's angels wanted to celebrate the enemy's demise.
God saw this and grew angry. He said, in essence, 'Stop celebrating. For they are my children,too.

And God said “Love Your Enemy,” and I obeyed him and loved myself.

A story in the Talmud relates that after the Israelites had safely crossed the Red Sea,* they sang a song of praise to God, but when the angels sought to join the triumphant paean, God thundered: “You shall not sing while my other children [the Egyptians] are drowning.

When we’re able to love our enemy, that person is no longer our enemy. The idea of “enemy” vanishes and is replaced by the person who is suffering and needs our compassion.

"Now there is a final reason I think that Jesus says, "Love your enemies." It is this: that love has within it a redemptive power. And there is a power there that eventually transforms individuals. Just keep being friendly to that person. Just keep loving them, and they can’t stand it too long. Oh, they react in many ways in the beginning. They react with guilt feelings, and sometimes they’ll hate you a little more at that transition period, but just keep loving them. And by the power of your love they will break down under the load. That’s love, you see. It is redemptive, and this is why Jesus says love. There’s something about love that builds up and is creative. There is something about hate that tears down and is destructive. So love your enemies. (from "Loving Your Enemies")"

if god loves me, he is my mortal enemy

The guardian angel who conquered your enemy in battle was perceived by your enemy as a demon destroyer

The Bible tells us to love our neighbors, and also to love our enemies; probably because generally they are the same people.

Returning hate for hate multiplies hate, adding deeper darkness to a night already devoid of stars. Darkness cannot drive out darkness; only light can do that. Hate cannot drive out hate; only love can do that. Hate multiplies hate, violence multiplies violence, and toughness multiplies toughness in a descending spiral of destruction. So when Jesus says “Love your enemies,” he is setting forth a profound and ultimately inescapable admonition. Have we not come to such an impasse in the modern world that we must love our enemies– or else? The chain reaction of evil–hate begetting hate, wars producing wars–must be broken, or we shall be plunged into the dark abyss of annihilation.

God's love toward us commends itself in this, that Christ died for us while we were still weak, still sinners, still godless, still enemies. It has therefore not waited for us, but has come to meet us and gone before us.

O Heavenly Children, the stories you have concocted in God's name have angered Him; for he would never instigate war between brothers, or encourage tribes to harbor resentment towards one another. He prefers the man who loves over the one who hates. And the man who spreads kindness, peace and knowledge, over the one who spreads lies, fear and terror — and misuses His name.

Those whom God wishes to destroy, he first makes angry.

[Martin Luther King, Jr.] concluded the learned discourse that came to be known as the 'loving your enemies' sermon this way: 'So this morning, as I look into your eyes and into the eyes of all my brothers in Alabama and all over America and over the world, I say to you,'I love you. I would rather die than hate you.''

Go ahead and reread that. That is hands down the most beautiful, strange, impossible, but most of all radical thing a human being can say. And it comes from reading the most beautiful, strange, impossible, but most of all radical civics lesson ever taught, when Jesus of Nazareth went to a hill in Galilee and told his disciples, 'Love your enemies, bless them that curse you, do good to them that hate you.

The sages taught the Jews not to rejoice over another’s misfortune. “Rejoice not when thine enemy falleth” (Proverbs 24:17). (I must confess that I have always enjoyed gloating over the comeuppance suffered by the detestable, regardless of race, color, or creed.)