When we begin to ask what the conditions of inner renewal are, we receive essentially the same answers from nearly all of those whom we have most reason to respect. Once major answer is the emphasis on discipline [emphasis mine]. In the conduct of one’s own life it is soon obvious, as many have learned the hard way, that empty freedom is a snare and a delusion. In following what comes naturally or easily, life simply ends in confusion, and in consequent disaster. Without the discipline of time, we spoil the next day the night before, and without the discipline of prayer, we are likely to end by having practically no experience of the divine-human encounter. However compassionate we may be to others, we dare not be soft or indulgent with ourselves. Excellence comes at a price, and one of the major prices is that of inner control.

We have not advanced very far in our spiritual lives if we have not encountered the basic paradox of freedom, to the effect that we are most free when we are bound. But not just any way of being bound will suffice; what matters is the character of our binding. The one who would like to be an athlete, but who is unwilling to discipline his body by regular exercise and by abstinence, is not free to excel on the field or the track. His failure to train rigorously and to live abstemiously denies him the freedom to go over the bar at the desired height, or to run with the desired speed and endurance. With one concerted voice the giants of the devotional life apply the same principle to the whole of life with the dictum: Discipline is the price of freedom.

—Elton Trueblood, The New Man for Our Time