Cast not away therefore your confidence, which has great recompense of reward. For you have need of patience, that, after you have done the will of God, you may receive the promise. – Hebrews 10:35.36

As the season advances, (the farmer’s) anxieties are prone to increase rather than to abate. If he has had long need of patience while the seasons have succeeded each other, and while organic changes have been in course of development, surely there is a stronger challenge of his patience as the crisis approaches when he shall reap the produce! How anxiously at this season will he observe the skies, watch the clouds, and wait the opportune time to get in his crops and garner them in good condition! Is there no peril that haunts him lest, after all, the blast or the mildew should cheat his hopes? Lest fierce winds should lay the full-grown stems prostrate on the ground? Lest then the pelting showers of rain should drench the well-filled ears of corn? I might almost call this the farmer’s last fear, and yet the most nervous fear that agitates his mind!

In like manner, beloved, we have a closing scene in prospect which may, and will in all probability, involve a greater trial of faith, and a sterner call for patience than any or all of the struggles through which we have already passed! “Cast not away therefore your confidence, which has great recompense of reward. For you have need of patience, that, after you have done the will of God, you may receive the promise.” This is sweet counsel for you, O Pilgrim, to Zion’s city bound. When you were young and strong, you did walk many a weary mile with that staff of promise; it helped you over the ground; don’t throw it aside as useless, now that you are old and infirm; lean upon it! Rest upon that promise, in your present weakness, which lightened your labor in the days of your vigor. “Cast not away your confidence.” But, brothers and sisters, there is something more. The apostle says, “You have need of patience, after you have done the will of God.” But, why, you will say, is patience so indispensable at this juncture of experience? Doubtless you all know that we are never so subject to impatience as when there is nothing we can do…Here it is, brothers and sisters that after our fight is fought, after our race is run, after our allotted task is finished, there is so much need of patience; of such patience as waits only on God, and watches unto prayer, that we may finish our course with joy, and the ministry we have received of the Lord Jesus. ~ C.H. Spurgeon

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