Too little liberty brings stagnation, and too much brings chaos.

The essence of education is that it is a change effected in the organism to satisfy the operator.

To think I have spent my life on absolute muck.

Philosophy, from the earliest times, has made greater claims, and achieved fewer results, than any other branch of learning.

This illustrates an important truth, namely, that the worse your logic, the more interesting the consequences to which it gives rise.

It appeared to me obvious that the happiness of mankind should be the aim of all action, and I discovered to my surprise that there were those who thought otherwise.

Religions that teach brotherly love have been used as an excuse for persecution, and our profoundest scientific insight is made into a means of mass destruction.