Nature seems at each man's birth to have marked out the bounds of his virtues and vices, and to have determined how good or how wicked that man shall be capable of being. Francois de La Rochefoucauld
Nearly every man who develops an idea works it up to the point where it looks impossible, and then he gets discouraged. That's not the place to become discouraged. Thomas A. Edison
Neither does man have gills for living in a water environment; yet it is not sinful to explore the depths of the oceans in search of food or other blessings. Walter Lang
Never let a man imagine that he can pursue a good end by evil means, without sinning against his own soul. The evil effect on himself is certain. Robert Southey
Never play cards with a man called Doc. Never eat at a place called Mom's. Never sleep with a woman whose troubles are worse than your own.
Nelson Algren
