Where is the gain?

What does man gain by all the toil at which he toils under the sun?
A generation goes, and a generation comes, but the earth remains forever.
The sun rises, and the sun goes down, and hastens to the place where it rises.
The wind blows to the south and goes around to the north; around and around goes the wind,
and on its circuits the wind returns.  All streams run to the sea, but the sea is not full; to the place where the streams flow, there they flow again.
(Ecclesiastes 1:3-7 ESVST)

Some people make living this life their goal. They work hard at living in hopes that they provide enough for themselves in order to ensure they would stay alive until they die.

All people will make that goal. It is not a noble goal. In fact, it is a foolish goal. No man knows the time of his death. Only God knows that. No man can care for Himself apart from God. Without God we have no past, present, or future.

God and His purposes do not change. We would be wise to align our thoughts and actions to be in harmony with the things that will not change