In this whole world everyone searches for happiness outside, but nobody understands their true self inside. Everybody says, “I” —But nobody understands this “I.” Before you were born, where did your “I” come from? When you die, where will your “I” go?
If you sincerely ask, “What am I?” sooner or later you will run into a wall where all thinking is cut off. We call this “don’t know.” Zen is keeping this “don’t know” mind always and everywhere.
–Zen Master Seung Sahn

When we return to don’t know, our thinking and emotions are cut off and we can see clearly our correct situation, our correct relationship and then act accordingly for the benefit of ourselves and others. In the Kwan Um School of Zen, we call that Great Love, Great Compassion and the Great Bodhisattva Way.

Student: What kind of Buddhism do you teach?
Zen master Seung Sahn: I only teach don’t know.