One cannot be a philosopher without believing in the power of reason. But one cannot be a conservative without doubting its power to order our affairs and ameliorate our condition.
Equally, one cannot be a philosopher without doubting — doubt being the engine of inquiry — and one cannot be a conservative without believing, that is, without accepting as true much that one cannot prove.
To live well we must somehow tread a razor's edge between unexamined belief and beliefless examination.