Little minds have little worries; big minds have no time for worries.
For every minute you are angry you lose sixty seconds of happiness.
The sun illuminates only the eye of the man, but shines into the eye and the heart of the child
Science does not know its debt to imagination.
No change of circumstances can repair a defect of character.
Great geniuses have the shortest biographies.
The faith that stands on authority is not faith.
Don't be too timid and squeamish about your actions. All life is an experiment.
The greatest homage we can pay truth is to use it.