Bible Commentary

Matthew 17:21

The Pulpit Commentary on Matthew 17:21

The Pulpit Commentary · Joseph S. Exell and contributors · Public domain

Self-discipline the secret of moral power.

"Howbeit this kind goeth not out but by prayer and fasting. There is some uncertainty about the word "fasting." The Revised Version omits the verse altogether. It is found, however, in Mark's Gospel, and introduces a valuable topic, which finds other expression in our Lord's teaching. A man can only be ready for a time of strain by constant and careful training. A man, to be always ready, must be always disciplining himself. And if his work is to take specially serious forms, his trainings and preparations must be specially adapted. Carefully distinguish between the moral character of self-discipline, which aims at gaining acceptance, and of self-discipline, which aims at faithfulness, and power to serve.

I. SELF-DISCIPLINE, ITS CHARACTERISTIC FEATURES. Character is the product of self-discipline. Our natural dispositions are not our character; it needs to be more clearly seen that character is something that a man wins by effort, or fails to win by wilfully making no effort. The measure of a man's self-discipline is the measure of his nobility; it is the sign of his manhood. This is true in the lower sphere, but it is much more true in the higher sphere. Self-discipline provides an infallible test of the Christian man, whose moderation, whose self-restraint, should be known in all things. The terms, "prayer," "fasting," classify the characteristic features of Christian self-discipline.

1. Prayer heads and represents all the positive forms.

2. Fasting heads and represents all the negative forms. Self-discipline is often misconceived, because it is represented only by fasting. It is thought of as only self-restraints, personal deprivations, bodily austerities, stern dealings even with our pleasant things. Fasting represents bodily subduings and humiliations. The Christian self-discipline is more vigorous on the positive side. Prayer represents putting life into good shape; ordering our habits; making and using all pious opportunities; laying hold of the strength of God. There is so much to do as well as so much to undo.

II. SELF-DISCIPLINE, ITS CHARACTERISTIC EFFECTS. The weak man is the undisciplined man, who is mastered by himself. A man gains moral power as he gains control over himself. A man never finds a harder foe to conquer, when he has mastered his own habits and passions. And our Lord here shows that no man can possibly have power to influence others unto noble attainments until he has won power over himself. The parent does no good with his children while he keeps his own character undisciplined.—R.T.

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