Machinery and labor-saving devices are only valuable as they serve to reduce the cost of manufacture.
人心比万物都诡诈，坏到极处，谁能识透呢？
The social brain hypothesis suggests that our intelligence evolved to manage our complex social lives.
不要施小恩惠而伤害整体，更不可以公济私。以常情宽恕别人，以道理约束自己。
人性既不是完全善良，也不是完全邪恶，而是两者兼有。
The best revenge is massive success.