The melancholy science from which I make this offering to my friend relates to a region that from time immemorial was regarded as the true field of philosophy, but which, since the latter's conversion into method, has lapsed into intellectual neglect, sententious whimsy, and finally oblivion.

追求幸福不是追逐快乐，而是培养意义。

统治阶级掌握着物质生产的手段；无产阶级仅有的是他们的劳动力。