All things in moderation................

     The archer who overshoots the target misses as much as the one who does not reach it.  Any my eyes trouble me as much when I raise them suddenly to a strong light as when I drop them into the shadow.  Callicles, in Plato, says that the extremity of philosophy is harmful, and advises us not to plunge into beyond the limits of profit; that taken with moderation, it is pleasant and advantageous, but that in the end it makes a man wild and vicious, disdainful of common religions and laws, an enemy of social intercourse, an enemy of human pleasures, incapable of any political administration and of helping others of himself, fit to be slapped with impunity.  He speaks truly, for in its excess it enslaves our natural freedom and, by importunate subtlety, leads us astray from the fine and level road that nature has traced for us.

-Michel De Montaigne, from his essay, Of Moderation