One of the main weaknesses of mankind is the average man's familiarity with the word 'impossible.'

One must marry one's feelings to one's beliefs and ideas. That is probably the only way to achieve a measure of harmony in one's life.

Perseverance: The majority of men meet with failure because of their lack of persistence in creating new plans to take the place of those that fail.

No man can succeed in a line of endeavor which he does not like.

One might call habit a moral friction: something that prevents the mind from gliding over things but connects it with them and makes it hard for it to free its…

Mortal danger is an effective antidote for fixed ideas.

Happiness is like a scooter; once you're up and running, you can just scoot along. It's getting up and running in the first place that's the tricky bit.