C. S. Lewis
This is exactly what Jesus meant when He said, “For whoever wants to save his life will lose it, but whoever loses his life for me and for the gospel will save it.” in Mark 8:35
If you are trying to gain the world, you will leave it with nothing. But, if you set your eyes on heavenly things, and Jesus Christ, you will learn what it means to have abundant life now—joy, peace, love, etc., and you will have it for all of eternity!