Read the last verse first and then the passage
1 Corinthians 15:58 Therefore, my beloved brethren, be steadfast, immovable, always abounding in the work of the Lord, knowing that your toil is not in vain in the Lord.
1 Corinthians 15:50-58 NASB (50) Now I say this, brethren, that flesh and blood cannot inherit the kingdom of God; nor does the perishable inherit the imperishable. (51) Behold, I tell you a mystery; we will not all sleep, but we will all be changed, (52) in a moment, in the twinkling of an eye, at the last trumpet; for the trumpet will sound, and the dead will be raised imperishable, and we will be changed. (53) For this perishable must put on the imperishable, and this mortal must put on immortality. (54) But when this perishable will have put on the imperishable, and this mortal will have put on immortality, then will come about the saying that is written, “DEATH IS SWALLOWED UP in victory. (55) “O DEATH, WHERE IS YOUR VICTORY? O DEATH, WHERE IS YOUR STING?” (56) The sting of death is sin, and the power of sin is the law; (57) but thanks be to God, who gives us the victory through our Lord Jesus Christ. (58) Therefore, my beloved brethren, be steadfast, immovable, always abounding in the work of the Lord, knowing that your toil is not in vain in the Lord.
Life can be very difficult most of the time. Some may be dealing with spiritual battles, death, financial losses, failing health, destroyed relationships, etc. I can remember back when I was in Little League playing baseball that I received a lesson. I was told that in order to play the game of baseball and to do it well then you must keep your eye on the ball. This baseball lesson has application to our spiritual life as well because we must keep our eyes on the ball or the reason that we are here. We are here for two main reasons. First, we are to glorify the Lord. Secondly, we are to be a servant unto our Lord and work. We must understand that our toil for the Lord is not in vain. We not only see the blessings of God in our life presently but also hold onto the blessings that will appear when we see our Lord. If we are His then we will work in order that others may hear and know that Jesus is the Savior of the world. When it is all over then we will know that it has been worth it all. Paul encourages us greatly in 2 Corinthians 4:15-18 NASB (15) “For all things are for your sakes, so that the grace which is spreading to more and more people may cause the giving of thanks to abound to the glory of God. (16) Therefore we do not lose heart, but though our outer man is decaying, yet our inner man is being renewed day by day. (17) For momentary, light affliction is producing for us an eternal weight of glory far beyond all comparison, (18) while we look not at the things which are seen, but at the things which are not seen; for the things which are seen are temporal, but the things which are not seen are eternal.” I heard that life is like making a cake. If you were to eat each individual ingredient separately then it would not be that pleasant. Think about eating plain flour, vanilla, or a raw egg? However, when all are placed together then you have a sweet dessert. We may have difficulties in life; however, keep your eyes on Jesus because the Lord is working all things for good. Stay encouraged my friend. It will be worth it all when we see our Savior face to face.