The secret of health for both mind and body is not to mourn for the past, nor to worry about the future, but to live the present moment wisely and earnestly.

Isn't it astonishing that all these secrets have been preserved for so many years just so we could discover them!

People should pursue what they're passionate about. That will make them happier than pretty much anything else.

We are what our thoughts have made us; so take care about what you think. Words are secondary. Thoughts live; they travel far.

If you don't like something, change it. If you can't change it, change your attitude. Don't complain.

The limits of the possible can only be defined by going beyond them into the impossible.

Climbing to the top demands strength, whether it is to the top of Mount Everest or to the top of your career.

When we see men of a contrary character, we should turn inwards and examine ourselves.

The fact that the great scientist believed in flying machines was the one thing that encouraged us to begin our studies.

If you put off everything till you're sure of it, you'll never get anything done.

People who say it cannot be done should not interrupt those who are doing it.

No leader can be too far ahead of his followers.

I love those who can smile in trouble...

All the darkness in the world cannot extinguish the light of a single candle.

My optimism wears heavy boots and is loud.

He was a dreamer, a thinker, a speculative philosopher... or, as his wife would have it, an idiot.

Whenever a negative thought concerning your personal power comes to mind, deliberately voice a positive thought to cancel it out.

Your pain is the breaking of the shell that encloses your understanding.

The only way of finding the limits of the possible is by going beyond them into the impossible.

Great spirits have always encountered violent opposition from mediocre minds.

Neither worse then or better is a thing made by being praised.