In the Symposium, written by the great philosopher Plato, Socrates describes love as a ladder that can be climbed to yet greater states of sensational existence.

8 Types of Love According to the Ancient Greeks:
Agape — Unconditional Love. First, we have agape love. ...
Eros — Romanic Love. Eros is named after the Greek god of love and fertility. ...
Philia — Affectionate Love. ...
Philautia — Self-love. ...
Storge — Familiar Love. ...
Pragma — Enduring Love. ...
Ludus — Playful Love. ...
Mania — Obsessive Love.

The first one Agape — Unconditional Love, is the most ultimate and maybe difficult to achieve.
If you have unconditional love, you can love your enemy.
If somebody slaps you on your left cheek, you can offer the right cheek to be slapped as well.
If somebody throws you stone, you can throw him bread in return.