What you feel about: Ecclesiastes Chapter 1

Written by the great King Solomon, and most of it reads:

The words of the Preacher, the son of David, king of Jerusalem.
Vanity of vanities! saith the Preacher,
Vanity of Vanities!
All is vanity!

What profit hath a man of all his labour which he taketh under the sun?
One generation passeth away, and another generation cometh, but the earth abides forever:
The sun also ariseth and hasteth to his place where he arose;
The wind goeth toward the south and turneth about unto the north...and returns again according to his circuits;
All the rivers

run into the sea, yet the sea is not full; from whence the rivers come, thither they return...

...the eye is not satisfied with seeing,
nor the ear filled with hearing.
The thing that has been, it is that which shall be;
And that which is done is that which shall be done,
And there is no new thing under the sun.

I the Preacher was king over Israel in Jerusalem.
And I gave my heart to seek and search out by wisdom concerning all things that are done under heaven...
I have seen all the works done under the sun, and behold, all is vanity and vexation of spirit.
That which is crooked cannot be made straight;
and that which is wanting cannot be numbered...
And I gave my heart to know wisdom and madness and foolishness;
I perceived that this also is vanity and vexation of spirit.
For in much wisdom is much grief, and he that increaseth knowledge, increaseth sorrow.