A liar will not be believed even when he speaks the truth.
Once you learn to quit, it becomes a habit.
Never let the future disturb you. You will meet it, if you have to, with the same weapons of reason which today arm you against the present.
We cannot direct the wind, but we can adjust the sails.
There is nothing in a caterpillar that tells you it's going to be a butterfly.
I confess that in 1901 I said to my brother Orville that man would not fly for fifty years.
Anyone who stops learning is old, whether at twenty or eighty. Anyone who keeps learning stays young.
You can wish for things in the future to be different, but in this moment you have to accept things as they are.
Isn't it astonishing that all these secrets have been preserved for so many years just so we could discover them!
Happiness depends more on the inward disposition of mind than on outward circumstances.
Knowing what's right doesn't mean much unless you do what's right.
Improvement makes strait roads, but the crooked roads without Improvement, are roads of Genius.
It's not whether you got knocked down; it's whether you get back up.
Character isn't something you were born with and can't change, like your fingerprints. It's something you weren't born with and must take responsibility for forming.
Good thoughts bear good fruit, bad thoughts bear bad fruit.
Waste no more time arguing about what a good man should be. Be one.
The great secret of true success, of true happiness, is this: the man or woman who asks for no return, the perfectly unselfish person, is the most successful.
The first rule is to keep an untroubled spirit. The second is to look things in the face and know them for what they are.
Defeat is not defeat unless accepted as a reality-in your own mind.
Change your thoughts and you change your world.
The secret to creativity is knowing how to hide your sources.