I would agree that one characteristic of a mad person is that he or she doesn't test their sobriety. They don't question themselves. On the contrary, they usually seem extremely confident. They strongly believe in their 'cause', whatever it can be. They draw the masses with the confidence, with such tragic consequences.
Their true motives and intentions, their psychological centre called the self, which is a superproduct of thought, are hidden in the shadow of the fragmentary perception.