Whatever deceives men seems to produce a magical enchantment.
When [a man] thinks that he is reasoning he is really disputing, just because he cannot define and divide, and so know that of which he is speaking; and he will pursue a merely verbal opposition in the spirit of contention and not of fair discussion.
When men speak ill of thee, live so as nobody may believe them.
When a person supposes that he knows, and does not know; this appears to be the great source of all the errors of the intellect.
When two friends, like you and me, are in the mood to chat, we have to go about it in a gentler and more dialectical way. By 'more dialectical,' I mean not only that we give real responses, but that we base our responses solely on what the interlocutor admits that he himself knows.