Discipline, strictly speaking, is activity carried on to prepare us indirectly for some activity other than itself. We do not practice the piano to practice the piano well, but to play it well.
Dallas WillardYou can live opposite of what you profess, but you cannot live opposite of what you believe.
Dallas WillardSpiritual formation for the Christian basically refers to the Spirit-driven process of forming the inner world of the human self in such a way that it becomes like the inner being of Christ himself.
Dallas Willard