Invert, always invert: Turn a situation or problem upside down.Look at it backward.

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.

A vision without execution is merely a dream.

大兵之间只有一种区别，就是活大兵与死大兵之别。