Doubt Must Be No More Than Vigilance,

Nothing Puts A Greater Obstacle In The Way Of The Progress Of Knowledge Than Thinking That One Knows What One Does Not Yet Know.

Honor Is Infinitely More Valuable Than Positions Of Honor.

A Man Is Never More Serious Than When He Praise Himself.

To See Every Day How People Get The Name 'genius' Just As The Wood-lice In The Cellar The Name 'millipede'-not Because They Have That Many Feet, But Because Most People Don't Want To Count To 14-this Has Had The Result That I Don't Believe Anyone Any More Without Checking.

Deliberate Virtue Is Never Worth Much: The Virtue Of Feeling Or Habit Is The Thing.