The desire to fly is an idea handed down to us by our ancestors who... looked enviously on the birds soaring freely through space... on the infinite highway of the air
Dictators ride to and fro upon tigers which they dare not dismount. And the tigers are getting hungry.
I am not young enough to know everything.
One day, in retrospect, the years of struggle will strike you as the most beautiful.
Is it not enough that 'things are cruel and blind'? Must we also be cruel and blind?
Amnesty is as good for those who give it as for those who receive it. It has the admirable quality of bestowing mercy on both sides.
Don't let making a living prevent you from making a life.
Nothing exists except atoms and empty space; everything else is opinion.
I've learned that even when I have pains, I don't have to be one.
We fear our highest possibility (as well as our lowest one). We are generally afraid to become that which we can glimpse in our most perfect moments.
In order to seek truth, it is necessary once in the course of our life to doubt, as far as possible, of all things.
The love of life is necessary to the vigorous prosecution of any undertaking.
Time ripens all things; no one is born wise.
Take a chance! All life is a chance. The man who goes farthest is generally the one who is willing to do and dare.
He who is in love with himself has at least this advantage - he won't encounter many rivals.
The present is theirs; the future, for which I really worked, is mine.
I generally avoid temptation unless I can't resist it.
Death is not the opposite of life, but a part of it.
I can't wait to figure out what is wrong with me, so I can say this is the way that I used to be.
History has shown there are no invincible armies.
Science is the most reliable guide for civilization, for life, for success in the world. Searching a guide other than the science is meaning carelessness, ignorance and heresy.