Ecclesiastes 2

The "Preacher" recalls how he pursued the natural man with riches and wealth and then learns -

"So I was great, and increased more than all that were before me in Jerusalem: also my wisdom remained with me.
10 And whatsoever mine eyes desired I kept not from them, I withheld not my heart from any joy; for my heart rejoiced in all my labour: and this was my portion of all my labour.
11 Then I looked on all the works that my hands had wrought, and on the labour that I had laboured to do: and, behold, all was vanity and vexation of spirit, and there was no profit under the sun."  (Ecclesiastes 2:9–11)

Which suggests to me that everything is fleeting (vanity) and does nothing to bring peace of the Spirit.   It follows the truth -

"For whosoever will save his life shall lose it; but whosoever shall lose his life for my sake and the gospel’s, the same shall save it."  (Mark 8:35)