And let us not be weary in well doing: for in due season we shall reap, if we faint not. – Galatians 6:9

The farmer waits under changing circumstances, and various contingences. At one time he sees the fair prospect of a good crop; the wheat has come up well; he has never seen greener springing from the ground! But perhaps it may be too strong and may need even to be put back. By-and-by, after long showers and cold nights, the wheat looks yellow, and he is half afraid about it; in a while there comes, or he fancies there is blight, or a black smut; nobody knows what may happen! Only a farmer knows how his hopes and fears alternate and fluctuate from time to time. It is too hot, too cold; it is too dry; it is too wet. It is hardly ever quite right, according to his judgment, or rather according to his unbelief. He is full of changes in his mind because the season is full of changes; yet he waits, and he waits with patience. Ah dear friends, when we work for God, how often will this happen! I speak from no inconsiderable experience; there are always changes in the field of Christian labor. At one time we see many conversions, and we bless God that there are so many seals to our testimony. But some of the converts after a while disappoint us; there was the blossom, but it produced no fruit; then there will come a season when many appear to backslide; the love of many waxes cold. Perhaps we have found in the church the black smut of heresy; some deadly heresy creeps in, and the anxious farmer fears there will be no harvest after all. Oh, patience, sir, patience!

So, too, maybe, O evangelical worker, it will be with you. When God shall give you a rich return for all you have done for Him, you will blush to think you ever doubted; you will be ashamed to think you ever grew weary in His service; you shall have your reward. Not tomorrow, so wait; not the next day perhaps, so be patient. You may be full of doubts one day, your joys sink low. It may be rough windy weather with you in your spirit; you may even doubt whether you are the Lord’s, but if you have rested in the name of Jesus; if by the grace of God you are what you are; if He is all your salvation, and all your desire—have patience, have patience, for the reward will surely come in God’s good time! ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/1025.cfm