'Seen' in the Bible

I have seen all the works that are done under the sun; and, behold, all is vanity and a striving after wind.

I have seen the travail which God hath given to the sons of men to be exercised therewith.

yea, better than them both did I esteem him that hath not yet been, who hath not seen the evil work that is done under the sun.

There is a grievous evil which I have seen under the sun, namely , riches kept by the owner thereof to his hurt:

Behold, that which I have seen to be good and to be comely is for one to eat and to drink, and to enjoy good in all his labor, wherein he laboreth under the sun, all the days of his life which God hath given him: for this is his portion.

There is an evil which I have seen under the sun, and it is heavy upon men:

moreover it hath not seen the sun nor known it; this hath rest rather than the other:

All this have I seen in my days of vanity: there is a righteous man that perisheth in his righteousness, and there is a wicked man that prolongeth his life in his evil-doing.

All this have I seen, and applied my heart unto every work that is done under the sun: there is a time wherein one man hath power over another to his hurt.

I have also seen wisdom under the sun on this wise, and it seemed great unto me:

There is an evil which I have seen under the sun, as it were an error which proceedeth from the ruler:

I have seen servants upon horses, and princes walking like servants upon the earth.