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I. THE ENGAGEMENT REFERRED TO. "Well-doing." What is well-doing?

(1)  It cannot be confounded with evil doing.

(2)  Resolving is not doing.

(3)  Professing is not doing.

(4)  Feeling is not doing.

1. Well-doing must respect ourselves. And this supposes that we have been converted from the evil of our ways, for we cannot do well in the ways of depravity and practical evil.

2. Well-doing must respect the Church. Our first concern must be our personal salvation and happiness, then the mystical body of Christ, the Church. We must be eyes to see, ears to harken, mouths to plead, hands to labour, feet to walk, or shoulders to bear for the body the Church (1 Corinthians 12:12-27; Ephesians 4:11-13).

3. Well-doing must respect the world. Believers are not of it, or conformed to it; but they are in it, and they must live to promote its welfare.

II. THE EXHORTATION GIVEN.

1. The text supposes that there is danger of wearying. This may arise from various causes.

(1)  Some are constitutionally wavering and unsettled.

(2)  Doing implies toil, and human nature is fond of ease.

(3)  Often difficulties in the way of well-doing, and resolution is indispensable.

(4)  Well-doing requires sacrifices, and we are prone to selfishness.

(5)  Satan and the world will be against us, so that we must fight and wrestle even in doing good.

(6)  Often our labours appear useless, and we are in danger of being discouraged.

2. Constancy and perseverance.

(1)  Because God has formed us especially for well-doing.

(2)  Because this is the great end of our regeneration, that we may live to God.

(3)  Because well-doing is inseparably connected with our safety.

(4)  Because it is always identified with our happiness.

(5)  Because it associates us with the highest orders of beings. All holy men have been acquainted practically with well-doing. Angels are always engaged in well-doing. But there is another consideration, which is —

III. THE MOTIVE THE TEXT ASSIGNS. "We shall reap if we faint not." "We shall reap."

1. The first-fruits here. In doing good we obtain good.

2. The full harvest hereafter. "In due season."

(1)  Be graciously abundant.

(2)  Be proportionate to our well-doing.

(3)  Our reaping is absolutely certain.

Application:

1. Evil-doers shall also reap — wretchedness and anxiety here, and eternal woe hereafter.

2. Those who cease well-doing cannot obtain the promised reward.

(J. Burns, D. D.)

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KJV: And let us not be weary in well doing: for in due season we shall reap, if we faint not.

WEB: Let us not be weary in doing good, for we will reap in due season, if we don't give up.