Mistakes are the portals of discovery.
The actions of men are the best interpreters of their thoughts.
A man of genius makes no mistakes; his errors are volitional and are the portals of discovery.
I've put in so many enigmas and puzzles that it will keep the professors busy for centuries arguing over what I meant, and that's the only way of insuring one's immortality.
Better pass boldly into that other world, in the full glory of some passion, than fade and wither dismally with age.