They that sow in tears shall reap in joy. – Psalm 126:5

You shall have a harvest, whatever you are doing. I trust you are all doing something. If I cannot mention what your peculiar engagement is, I trust you are all serving God in some way; and you shall assuredly have a harvest wherever you are scattering your seed. But suppose the worst,- if you should never live to see the harvest in this world, you shall have a harvest when you get to heaven. If you live and die a disappointed man in this world, you shall not be disappointed in the next. I think how surprised some of God’s people will be when they get to heaven. They will see their Master, and He will give them a crown, “Lord, what is that crown for?” “That crown is because thou didst give a cup of cold water to one of My disciples.” “What! a crown for a cup of cold water?” “Yes,” says the Master, “that is how I pay My servants. First I give them grace to give that cup of water, and then, having given them grace, I give them a crown.” “Wonders of grace to God belong.” He that soweth liberally shall reap liberally; and he that soweth grudgingly shall reap sparingly. Ah, if there could be grief in heaven, I think it would be the grief of some Christians who had sown so very little. After all, how little the most of us over sow! I know I sow but very little compared with what I might. How little any of you sow! Just add up how much you give to God in the year. I am afraid it would not come to a farthing per cent. Remember, you reap according to what you sow. O my friends, what surprise some of you will feel when God pays you for sowing one single grain! The soil of heaven is rich in the extreme. If a farmer had such ground as there is in heaven, he would say, “I must sow a great many acres of land; “and so let us strive, for the more we sow, the more shall we reap in heaven. Yet remember it is all of grace, and not of debt.~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2896.cfm