The practice of mindfulness unveils and reveals your essential Good Heart, because it dissolves and removes the unkindness or the harm in you. Only when you have removed the harm in yourself do you become truly useful to others. Through the practice, by slowly removing the unkindness and harm from yourself, you allow your true Good Heart, the fundamental goodness and kindness that are your real nature, to shine out and become the warm climate in which your true being flowers.
This is why I call meditation the true practice of peace, the true practice of nonaggression and nonviolence, and the real and greatest disarmament.
—Tibetan Book of Living and Dying, chapter 5

Sogyal Rinpoche