Three things are necessary for the salvation of man: to know what he ought to believe； to know what he ought to desire； and to know what he ought to do.

The learn-it-all does better than the know-it-all.

说出真相的唯一方式是以权威的口吻说话，而以权威的口吻说话的唯一方式是声称自己有权利说出真相。