The Art of Teaching Science by Lewis Thomas HERE.
The conclusions reached in science are always, when looked at closely, far more provisional and tentative than are most of the assumptions arrived at by our colleagues in the humanities. But we do not talk much in public about this, nor do we teach this side of science. We tend to say instead: These are the facts of the matter, and this is what the facts signify. Go and learn them, for they will be the same forever.