Ecclesiastes 2:18 Yea, I hated all my labour which I had taken under the sun: because I should leave it unto the man that shall be after me.
When we work so hard we need to remember and think about who we are working for. Soon it will all belong to another person any way. Our children or another will take it over.
To me that makes me even more want to do a work for God. If I do it for Him now then it is already another’s. I know that what I do only has lasting value if He is pleased.
Be careful what you are doing and why you are doing it! Serve the God of heaven. Do all for Him. Otherwise it is wasted work.