Rule of 3 in conversation. To get to the real reason， ask a person to go deeper than what they just said. Then again， and once more. The third time’s answer is close to the truth.

"The truth is rarely pure and never simple."

历史学家必须兼具诗人和哲学家的特质。

解析：自然的法则，是损减有余来补充不足；人类社会世俗的作法却不然，而是损减贫穷不足来供奉富贵有余。