Oscar Wilde 
Pen, pencil and poison [PDF ebook] 

It has constantly been made a subject of reproach against artists and men of letters that they are lacking in wholeness and completeness of nature. As a rule this must necessarily be so. That very concentration of vision and intensity of purpose which is the characteristic of the artistic temperament is in itself a mode of limitation. To those who are preoccupied with the beauty of form nothing else seems of much importance. Yet there are many exceptions to this rule.