An argument fatal to the communist theory, is suggested by the fact, that a desire for property is one of the elements of our nature.

The wise man must remember that while he is a descendant of the past, he is a parent of the future.

Rightness expresses of actions, what straightness does of lines; and there can no more be two kinds of right action than there can be two kinds of straight lines.

All socialism involves slavery. That which fundamentally distinguishes the slave is that he labours under coercion to satisfy anothers desires.

In science the important thing is to modify and change one's ideas as science advances.

Science is organized knowledge.

Policeman are soldiers who act alone; soldiers are policeman who act in unison.