Discipline your mind. Shantideva underlines the critical importance of this inner discipline with a wonderful analogy:
Where would I possibly find enough leather
With which to cover the surface of the earth?
But (wearing) just leather on the soles of my shoes
Is equivalent to covering the earth with it. — Geshe Thupten Jinpa, Healing Anger by His Holiness The Dalai Lama, Geshe Thupten Jinpa, translator