Jerry Fodor writes:
If there’s anything we philosophers really hate it’s an untenable dualism. Exposing untenable dualisms is a lot of what we do for a living. It’s no small job, I assure you. They (the dualisms, not the philosophers) are insidious, and they are ubiquitous; perpetual vigilance is required. I mention only a few of the dualisms whose tenability we have, at one time or other, felt called on to question: mind v. body; fact v. value; knowledge v. true belief; induction v. deduction; sensing v. perceiving; thinking v. behaving; denotation v. connotation; thought v. action; appearance v. reality . . . I could go on. It is, moreover, a mark of an untenable dualism that a philosopher who is in the grip of one is sure to think that he isn’t. In such a case, therapy can require millennia of exquisitely subtle dialectics. No wonder philosophers are paid so well.