Whether our action is wholesome or unwholesome depends on whether that action or deed arises from a disciplined or undisciplined state of mind. It is felt that a disciplined mind leads to happiness and an undisciplined mind leads to suffering, and in fact it is said that bringing about discipline within one's mind is the essence of the Buddha's teaching.
― Dalai Lama XIV, The Art of Happiness
Discipline is remembering what you want.
― David Campbell
1. The Year of Less: How I Stopped Shopping, Gave Away My Belongings, and Discovered Life Is Worth More Than Anything You Can Buy in a Store by Cait Flanders
2. The Values Factor: The Secret to Creating an Inspired and Fulfilling Life by Dr. John Demartini