Spiritual 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 WillardEven professing Christians, by and large, devote to their spiritual growth and well-being a tiny fraction of the time they devote to their body, and it is even tinier fraction if we include what they worry about.
Dallas WillardThe idea of having faith in Jesus has come to be totally isolated from being his apprentice and learning how to do what he said.
Dallas Willard