The natural effort of every individual to better his own condition， when suffered to exert itself with freedom and security， is so powerful a principle that it is alone， and without any assistance， not only capable of carrying on the society to wealth and prosperity but of surmounting a hundred impertinent obstructions with which the folly of human laws too often encumbers its operations.

正义是一种非理性的理想。

译文：人贪心不足，就像小蛇想吞掉大象一样，世间的事情就像螳螂捕蝉黄雀在后一般。赏析：贪得无厌只会祸患无穷，人生最大的祸事就是不懂得满足。处处算计别人，事事喜欢占人便宜，最后都会被别人算计。

理论的任务是描述观察之间的联系。

农业的成功不仅仅以产量衡量，还以我们为后代留下的遗产衡量。

对感受者而言，生活是悲剧；对思考者而言，生活是喜剧。