ACQUAINTANCE; companion;
One dear brilliant woman;
The best-endowed, the elect,
All by their youth undone,
All, all, by that inhuman
Bitter glory wrecked.
But I have straightened out
Ruin, wreck and wrack;
I toiled long years and at length
Came to so deep a thought
I can summon back
All their wholesome strength.
What images are these
That turn dull-eyed away,
Or Shift Time's filthy load,
Straighten aged knees,
Hesitate or stay?
What heads shake or nod?

William Butler Yeats

http://www.poemhunter.com/poem/the-results-of-thought/