William Butler Yeats
The intellect of man is forced to choose
Perfection of the life, or of the work,
And if it take the second must refuse
A heavenly mansion, raging in the dark.
When all that story's finished, what's the news?
In luck or out of toil has left its mark:
That old perplexity an empty purse,
Or the day's vanity, the night's remorse.