They run through all subjects that each may have something to say; they exhaust no subject for fear of tiring their hearer; they propose their themes casually and they treat them rapidly; each succeeding subject grows naturally out of the preceding one; each talker delivers his opinion and supports it briefly; no one attacks with undue heat the supposition of another, nor defends obstinately his own; they examine in order to enlighten, and stop before the discussion becomes a dispute.