It is only the fundamental conceptions of psychology which are of real value to a teacher.

The greatest empiricists among us are only empiricists on reflection: when left to their instincts, they dogmatize like infallible popes.

As there is no worse lie than a truth misunderstood by those who hear it, so reasonable arguments, challenges to magnanimity, and appeals to sympathy or justice, are folly when we are dealing with human crocodiles and boa-constrictors.

The mind is made up by what it feeds upon.

When a superior intellect and a psychopathic temperament coalesce in the same individual, we have the best possible condition for the kind of effective genius that gets into the biographical dictionaries.

The total possible consciousness may be split into parts which co-exist but mutually ignore each other.

A chain is no stronger than its weakest link, and life is after all a chain.