Look into the eyes of your beloved and ask deeply, “Who are you, my love, who has come to me and taken my suffering as your suffering, my happiness as your happiness, my life and death as your life and death? Who are you whose self has become my self? Why aren’t you a dewdrop, a butterfly, a bird, a pine tree?” Ask with your whole body and mind. Later, you will have to ask the person who causes you the most suffering the same questions: “Who are you who brings me such pain, who makes me feel so much anger and hatred?” To understand, you have to become one with your beloved, and also one with your so-called enemy. You have to worry about what they worry about, suffer their suffering, appreciate what they appreciate. You and the object of your love cannot be two. They are as much you as you are yourself.

Continue until you see yourself in the cruelest person on Earth, in the child starving, in the political prisoner. Practice until you recognize yourself in everyone in the supermarket, on the street corner, in a concentration camp, on a leaf, in a dewdrop. Meditate until you see yourself in a speck of dust in a distant galaxy. See and listen with the whole of your being. If you are fully present, the rain of the Dharma will water the deepest seeds in your store consciousness, and tomorrow, while you are washing the dishes or looking at the blue sky, that seed will spring forth, and love and understanding will appear as a beautiful flower.

-Thich Nhat Hanh
“Teachings on Love”