“Reason and free inquiry are the only effectual agents against error.”

Don't talk about what you have done or what you are going to do.

Do you want to know who you are? Don't ask. Act! Action will delineate and define you.

Never put off till tomorrow what you can do today.

I'm a great believer in luck and I find the harder I work, the more I have of it.

A prudent question is one half of wisdom.

Setting an example is not the main means of influencing another, it is the only means.

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

The more you know yourself, the more you forgive yourself.