Human nature must not be altered in order to have a problem-free world. Man is not just a problem-solving being, as behaviorists would wish us to believe, but a problem-recognizing and -accepting being.
There is one thing a professor can be absolutely certain of: almost every student entering the university believes, or says he believes, that truth is relative.
To recognize that some of the things our culture believes are not true imposes on us the duty of finding out which are true and which are not.
There is no real teacher who in practice does not believe in the existence of the soul, or in a magic that acts on it through speech.