Nathaniel Hawthorne, Blithedale Romance

The greatest obstacle to heroism is the doubt whether one may not be going to prove one's self a fool; the truest heroism is to resist the doubt; and the profoundest wisdom is know when it ought to be resisted, and when to be obeyed. Yet, after all, let us acknowledge it wiser, if not more sagacious, to follow out one's day-dream to its natural consummation, although if the vision have been worth the having, it is certain never to be consummated otherwise than by failure.