Whenever our heart opens to another person, we experience a moment of unconditional love. People commonly imagine that unconditional love is a high or distant ideal, one that is difficult, if not impossible, to realize. Yet though it may be hard to put into everyday practice, its nature is quite simple and ordinary: opening and responding to another person's being without reservation.
Look at this window: it is nothing but a hole in the wall, but because of it the whole room is full of light. So when the faculties are empty, the heart is full of light. Being full of light it becomes an influence by which others are secretly transformed.