You really can't justify anything else but giving your whole attention to spiritual formation in Christ.
Dallas WillardToday we are apt to downplay or disregard the importance of good thinking to strong faith; and some, disastrously, even regard thinking as opposed to faith.
Dallas WillardOther kingdoms are still present on earth along with the kingdom of the heavens. That is the human condition.
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 WillardThe real issue relating to exclusiveness is whether or not the Christian actually has a relationship with God, a presence of God, which non-Christians do not have. Apart from Christian spiritual formation as described here, I believe there is little value in claiming exclusiveness for the Christian way.
Dallas Willard