"Does philosophy, then, make happiness?" said he, interrupting. "Assuredly, ' I said, 'and it alone.' " "'What, then, is philosophy?' he says; 'and what is happiness? Pray tell me, unless something hinders you from saying.'" "'Philosophy, then, ' said I, 'is the knowledge of that which really exists, and a clear perception of the truth; and happiness is the reward of such knowledge and wisdom.'" "'But...