I am an American; free born and free bred, where I acknowledge no man as my superior, except for his own worth, or as my inferior, except for his own demerit.
The scientists of today think deeply instead of clearly. One must be sane to think clearly, but one can think deeply and be quite insane.
In order to seek truth, it is necessary once in the course of our life to doubt, as far as possible, of all things.
We keep moving forward, opening new doors, and doing new things, because we're curious and curiosity keeps leading us down new paths.
Life always waits for some crisis to occur before revealing itself at its most brilliant.
I want to feel my life while I'm in it.
The young people think the old people are fools - but the old people know the young people are fools.
Boys will be boys. And even that wouldn't matter if only we could prevent girls from being girls.
Speed and efficiency do not always increase the quality of life.
You can't live your life for other people. You've got to do what's right for you, even if it hurts some people you love.
To cherish what remains of the Earth and to foster its renewal is our only legitimate hope of survival.
Colors, like features, follow the changes of the emotions.
It is only because of problems that we grow mentally and spiritually.
The less you know, the more you believe.
Yesterday is dead, tomorrow hasn't arrived yet. I have just one day, and I'm going to be happy in it.
To live is the rarest thing in the world. Most people exist, that is all.
If it is worth doing, it is worth overdoing.
I think it's much more interesting to live not knowing than to have answers which might be wrong.
Life is too short for long-term grudges.
Being a hero is about the shortest-lived profession on earth.
Some days you're the bug, some days you're the windshield.