When a person can no longer laugh at himself, it is time for others to laugh at him.
If the dead talk to you, you are a spiritualist; if God talks to you, you are a schizophrenic.
A teacher should have maximal authority, and minimal power.
Two wrongs don't make a right, but they make a good excuse.
Formerly, when religion was strong and science weak, men mistook magic for medicine; now, when science is strong and religion weak, men mistake medicine for magic.
The language of science—and especially of a science of man—is, necessarily, anti-individualistic, and hence a threat to human freedom and dignity.