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The methods of the natural sciences cannot be applied to human behavior because this behavior...lacks the peculiarity that characterizes events in the field of the natural sciences, viz., regularity.

Scientific research sooner or later, but inevitably, encounters something ultimately given that it cannot trace back to something else of which it would appear as the regular or necessary derivative. Scientific progress consists in pushing further back this ultimately given.

The criterion of truth is that it works even if nobody is prepared to acknowledge it.

People do not cooperate under the division of labor because they love or should love one another. They cooperate because this best serves their own interests. Neither love nor charity nor any other sympathetic sentiments but rightly understood selfishness is what originally impelled man to adjust himself to the requirements of society, to respect the rights and freedoms of his fellow men and to substitute peaceful collaboration for enmity and conflict.