Then I looked on all the works that my hands had wrought, and on the labor that I had labored to do: and behold, all was vanity and vexation of spirit, and there was no profit under the sun.

Come to me, all ye that labor, and are heavy laden, and I will give you rest.

For we know that the whole creation groaneth, and travaileth in pain together until now:

Man

So I returned, and considered all the oppressions that are done under the sun: and behold the tears of such as were oppressed, and they had no comforter; and on the side of their oppressors there was power; but they had no comforter.

That which is far off, and exceedingly deep, who can find it out?

The eye

There is one alone, and there is not a second; yes, he hath neither child nor brother: yet is there no end of all his labor; neither is his eye satisfied with riches; neither saith he, For whom do I labor, and bereave my soul of good? This is also vanity, yes, it is a grievous labor.

He that loveth silver shall not be satisfied with silver; nor he that loveth abundance with increase: this is also vanity.

My soul shall be satisfied as with marrow and fatness; and my mouth shall praise thee with joyful lips:

Hell and destruction are never full; so the eyes of man are never satisfied.

The horse-leech hath two daughters, crying, Give, give. There are three things that are never satisfied, yes, four things say not, It is enough:

Blessed are they who hunger and thirst for righteousness: for they shall be filled.

They shall hunger no more, neither thirst any more; neither shall the sun light on them, nor any heat.

General references

Seeing there are many things that increase vanity, what is man the better?