On (恩) describes the debt of gratitude you carry when someone does something significant for you. Unlike Western gratitude, which can be discharged with a thank-you note, on is heavy and enduring. If a teacher shapes your career, you carry on toward them for life. If a stranger saves your life, the on is almost unbearable in its weight. On creates the deep loyalty networks that hold Japanese society together — but it also creates pressure, because an unpaid on is a source of genuine distress.

Explore more Japanese wisdom in the books of Takeshi Mori at takeshimori.com.

Join the Takeshi Mori community at takeshimori.com for your free guide to Japanese philosophy for modern life.