We spend our whole lives working hard, either as employees or as entrepreneurs, but we work with a purpose, we do not do it simply for doing it, because, we always expect to see a reward for what we do. In the same way it happens in Christianity, at the end of our career we expect to see a reward in our lives, a promise fulfilled and we should not be discouraged, because the one who promised is faithful to fulfill.
The apostle Paul wrote:
57 But thanks be to God! He gives us the victory through our Lord Jesus Christ.
58 Therefore, my dear brothers and sisters, stand firm. Let nothing move you. Always give yourselves fully to the work of the Lord, because you know that your labor in the Lord is not in vain.
1 Corinthians 15:57-58
This entire chapter is dedicated to talk about the resurrection of the dead, and that is because we have that promise from our Lord Jesus Christ, that just as He was resurrected, we will also be resurrected and live for an eternity praising the name of God .