Belief begins where science leaves off and ends where science begins.

Laws should be made, not against quacks but against superstition.

Those who have dissected or inspected many [bodies] have at least learnt to doubt; while others who are ignorant of anatomy and do not take the trouble to attend it are in no doubt at all.

Disease may be defined as 'A change produced in living things in consequence of which they are no longer in harmony with their environment.

There are no mineral monsters.

You cannot separate passion from pathology any more than you can separate a person's spirit from his body.