It was while teaching philosophy that I saw how easily one can say... what one wants to say.... In fact, I became particularly aware if the dangers of speculation... It's so much easier than digging out the facts. You sit in your office and build a system. But with my training in biology, I felt this kind of undertaking precarious.
Conversations with Jean Piaget (ed. University of Chicago Press, 1989) - ISBN: 9780226075051