The Profession of Philosophers

It is the profession of philosophers to question platitudes that
others accept without thinking twice. A dangerous profession, since philosophers are more easily discredited than platitudes, but a useful one.
For when a good philosopher challenges a platitude, it usually turns out that the platitude was essentially right; but the philosopher has noticed trouble that one who did not
think twice could not have met. In the end the
challenge is answered and the platitude survives, more often
than not. But the philosopher has done the
adherents of the platitude a service: he has made them think twice.

David K. Lewis, Convention (1969)