Science is a systematic means of gaining reliable knowledge.

One can think effectively only when one is willing to endure suspense and to undergo the trouble of searching.

Even today, in our industrial life, apart from certain values of industriousness and thrift, the intellectual and emotional reaction of the forms of human association under which the world's work is carried on receives little attention as compared with physical output.

It science involves an intelligent and persistent endeavor to revise current beliefs so as to weed out what is erroneous, to add to their accuracy, and, above all, to give them such shape that the dependencies of the various facts upon one another may be as obvious as possible.

As long as politics is the shadow cast on society by big business, the attenuation of the shadow will not change the substance.

When others are not doing what we would like them to or are threatening disobedience, we are most conscious of the need of controlling them and of the influences by which they are controlled.

Knowledge falters when imagination clips its wings or fears to use them.