I know what I know

I know what I know
And I've seen what I've seen
But what I know and what i've seen
Are two different things
The things I've seen
Haven't always taught
Nor the things i've done
Or the things i ought
But at the end of the day
Can anything be said
We all live our lives
And wind up dead
Like the famous author
Of ecclesiastes
We all conclude
With our head on our knees
That there's nothing new
On earth under the sun
Yet each day must still dawn
And each battle must be won