交换、交易和互换的倾向普遍存在于所有人之中,而在其他动物种族中找不到。
一个善待别人的人,别人也会善待你。《孟子》中也说“爱人者,人恒爱之;敬人者,人恒敬之”,爱别人的人,别人也会爱他;尊敬别人的人,别人也会尊敬他。
The most dangerous weapon is not the one that kills, but the one that changes minds.
If ease of use was the only requirement, everyone would still be riding tricycles.