Galations 6:9-10 says, “And let us not grow weary while doing good, for in due season we shall reap if we do not lose heart. Therefore, as we have opportunity, let us do good to all, especially to those who are of the household of faith.”
And we have a similar thought in 2 Thess. 3:13: “But as for you, brethren, do not grow weary in doing good.”
From these verses, we can gather than it is common for us to grow weary of doing good. Why else would the Apostle Paul feel it necessary to mention this not once, but twice? Is weariness a sin?
I think there are two kinds of weariness. The first kind is how we might feel at the end of a very productive and tiring day. We are tired or even exhausted from our labors. This kind of weariness is to be expected. I don’t think being tired is a sin, but a good sign.
But there is another kind of weariness. Consider these comments and think of others like them: “I grow weary of the baby’s crying.” “I am tired of homeschooling.” “I am sick of picking up after you.” “I am weary of having guests.”
You get the idea. That kind of weariness is more like impatience than exhaustion. This kind of weariness is discontent. It is dissatisfied, feeling put upon. This kind of weariness has begun to view “good works” as tedious bothers. “Let someone else do it. I never get thanked or noticed anyway.” This kind of weariness is sinful. It bears sour fruit.
So this explains why Paul would mention this temptation to us. We can grow weary of doing good. Again. Here’s the admonishment: Don’t grow discontent with serving others. Keep taking every opportunity you have to do good, especially to your fellow saints. Don’t lose heart! God sees your labors. You may be tired, but you don’t have to grow weary. In due time, you will see a harvest of good things from all those seeds that you put in the ground. Hang on! Don’t give up! Press on!