Animals have no second thoughts; man alone is able to see his own thought double, as a drunkard sees a lamp-post; man alone is able to see his own thought upside down as one sees a house in a puddle.

动物不会重新审视自己的念头；唯有人能像醉汉看灯柱般，看见自己思想的重影；也唯有人能像看水洼中的房屋般，将自己的思想倒过来看。