Philosophy is written in this grand book, the universe, which stands continually open to our gaze. But the book cannot be understood unless one first learns to comprehend the language and read the letters in which it is composed. It is written in the language of mathematics, and its characters are triangles, circles, and other geometric figures, without which it is humanly impossible to understand a single word of it.
I do not feel obliged to believe that the same God who has endowed us with senses, reason, and intellect has intended us to forgo their use and by some other means to give us knowledge which we can attain by them.
All truths are easy to understand once they are discovered; the point is to discover them.
Men are at variance with the one thing with which they are in the most unbroken communion, the reason that administers the whole universe.
And those who were seen dancing were thought to be insane by those who could not hear the music.
It is only with the heart that one can see rightly; what is essential is invisible to the eye.