And I believe that the answer is found in ECC12:7 !!
It reads , Then shall the dust return to the earth as it was and the spirit shall return unto God who gave it .
When an unbeliever does , die , that spirit from man can not come BACK .
SO , a believer death as pictured in 1 Cor 5:5 may be saved , when Christ is COMING / PAROUSIA , 2 Thess 2:1 to rescue us at what many call the rapture , BUT in the bible , there is NOT a Greek for rapture , how about that .
I see that it's time for the part where we discuss how hazardous it is to form doctrine from verses plucked from Ecclesiastes...
You must consider context
before quoting Ecclesiastes as an authoritative statement on HOW THINGS ARE. There are many STATEMENTS in the book of Ecclesiastes that I would consider to be UNTRUE. Almost all of the book is written as a narrative, and that is the narrative of a sophist who has come to the end of his sophistry and discovered that it's not worth a plugged nickel, because in his own power he can accomplish 0% of what God can accomplish through him at his most foolish.
Consider the doctrines we can deduce from Ecclesiastes when we take verses out of this context:
1) Nothing we do really matters
"Utterly meaningless! Everything is meaningless."
"I have seen all the things that are done under the sun; all of them are meaningless, a chasing after the wind."
2) All activity is merely a burden from God.
"All things are wearisome, more than one can say."
"What does the worker gain from his toil? I have seen the burden God has laid on men. "
3) Wisdom is not superior to foolishness
"The wise man has eyes in his head, while the fool walks in the darkness; but I came to realize that the same fate overtakes them both. The fate of the fool will overtake me also. What then do I gain by being wise? This too is meaningless."
4) Men are not superior to the animals in any regard
"Man's fate is like that of the animals; the same fate awaits them both: As one dies, so dies the other. All have the same breath [fn]; man has no advantage over the animal. Everything is meaningless."
5) We would be better off if we had never been born.
"I declared that the dead, who had already died, are happier than the living, who are still alive. But better than both is he who has not yet been, who has not seen the evil that is done under the sun."
Suffice it to say that this book sets forth an example for us of the futility of human existence APART FROM GOD. As you read it, you should not think, "This is how things are and how God has made them." You should think, "There but for the grace of God go I."
For this verse in particular, you should not taken it as 'God said this.'
You should take it as 'Solomon gave this as an example of worldly-wisdom, for the purpose of afterwards poo-poo-ing all worldly-wisdom.'