Islam is the best religion and Muslims are the worst followers

I ... must continue to strive for more knowledge and more power, though the new knowledge always contradicts the old and the new power is the destruction of the fools who misuse it.

Never waste jealousy on a real man: it is the imaginary man that supplants us all in the long run.

You see things and you say, 'Why?'. But I dream things and I say, 'Why not?'.

All progress depends upon the unreasonable person.

The mathematician is fascinated with the marvelous beauty of the forms he constructs, and in their beauty he finds everlasting truth.

German and Spanish are accessible to foreigners: English is not accessible even to Englishmen.