A mathematical equation stands forever.

Belief in an external world independent of the perceiving subject is the basis of all natural science.

It is little short of a miracle that modern methods of instruction have not already completely strangled the holy curiosity of inquiry.... I believe that one could even deprive a healthy beast of prey of its voraciousness if one could force it with a whip to eat continuously whether it were hungry or not.

We are all very ignorant. What happens is that not all ignore the same things.

Balance in large measure is knowing the things that can be changed, putting them in proper perspective, and recognizing the things that will not change."

As for the search for truth, I know from my own painful searching, with its many blind alleys, how hard it is to take a reliable step, be it ever so small, towards the understanding of that which is truly significant.

To get to know a country, you must have direct contact with the earth. It's futile to gaze at the world through a car window.