I am by the law of my nature a reasoner. A person who should suppose I meant by that word, an arguer, would not only not understand me, but would understand the contrary of my meaning. I can take no interest whatever in hearing or saying any thing merely as a fact — merely as having happened. It must refer to something within me before I can regard it with any curiosity or care. My mind is always energic — I don't mean energetic; I require in every thing what, for lack of another word, I may call propriety, — that is, a reason why the thing is at all, and why it is there or then rather than elsewhere or at another time.

1 March 1834 - Table Talk (1821-1834)