【18】Aristotle and Greek Science

Though external goods and relationships are necessary to happiness, its essence remains within us, in rounded knowledge and clarity of soul.

we scratch that we may itch, and itch that we may scratch.

the whims of the people --> 民粹主义
（推荐书：《乌合之众》）

nothing is so fickle as the crowd. 最高级形式的表达