'Striving' in the Bible

I have seen all the works which have been done under the sun, and behold, all is vanity, a futile grasping and chasing after the wind.

Then I considered all which my hands had done and labored to do, and behold, all was vanity and chasing after the wind and there was no profit (nothing of lasting value) under the sun.

So I hated life, for the work which had been done under the sun caused me only great sorrow; because all is futility and chasing after the wind.

For what does a man get from all his labor and from the striving and sorrow of his heart with which he labors under the sun?

For to the person who pleases Him God gives wisdom, knowledge, and joy; but to the sinner He gives the work of gathering and collecting so that he may give to one who pleases God. This too is vanity and chasing after the wind.

I have seen that every [effort in] labor and every skill in work comes from man’s rivalry with his neighbor. This too is vanity (futility, false pride) and chasing after the wind.

One hand full of rest and patience is better than two fists full of labor and chasing after the wind.

There is no end to all the people; to all who were before them. Yet those who come later will not be happy with him. Surely this also is vanity (emptiness) and chasing after the wind.

What the eyes see [enjoying what is available] is better than [craving] what the soul desires. This too is futility and chasing after the wind.