Beyond the realms of what we see, into the regions or the unexplored limited only by our imaginations.

Science has brought forth this danger, but the real problem is in the minds and hearts of men.

There is no vaccine against stupidity.

The enormous mental resilience, without which no Chess player can exist, was so much taken up by Chess that he could never free his mind of this game

One may say the eternal mystery of the world is its comprehensibility.

What distinguishes the language of science from language as we ordinarily understand the word? ... What science strives for is an utmost acuteness and clarity of concepts as regards their mutual relation and their correspondence to sensory data.

My only refuge, as a serious young man, from the despair of my financial burden to my family, is that I did everything I could to never permit myself any amusements or diversions except those afforded by my studies.