Man is not the creature of circumstances, circumstances are the creatures of men. We are free agents, and man is more powerful than matter.

Never apologize for showing feeling. When you do so, you apologize for the truth.

The secret of success is constancy of purpose.

Cleanliness and order are not matters of instinct; they are matters of education, and like most great things, you must cultivate a taste for them.

Nurture your mind with great thoughts, for you will never go any higher than you think.

Action may not always bring happiness; but there is no happiness without action.

Courage is fire, and bullying is smoke.

One secret of success in life is for a man to be ready for his opportunity when it comes.

Time is precious, but truth is more precious than time.

Never complain and never explain.

Finality is not the language of politics.

To know my soul is my greatest knowledge.

The sky belongs to eagles, even during storms.

Does light go faster when it goes downhill?

Coming from a big family, I learned a lot. Things don't have to be perfect. You can do okay with 'almost.'

A billion dollars every week for Iraq, $87 billion for Iraq. We can't get $5 billion for childcare over five years in welfare reform.

I love my fans because they're smart, dude.

No-one really thought of fission before its discovery.

When I'm on the road, I wake up early and walk a lot. I'm very healthy. But when I come back home, I am more tempted by guilty pleasures, such as eating too many sweets and sleeping a lot.

Some of the best art occurs when people are oppressed. That's just what we do as a species when something shakes us up.

A lot of making TV is lightening in a bottle.