```"No thinking and no acting would be possible to man if the universe were chaotic, i.e., if there were no regularity whatever in the succession and concatenation of events. In such a world of unlimited contingency nothing could be perceived but ceaseless kaleidoscopic change. There would be no possibility for man to expect anything. All experience would be merely historical, the record of what has happened in the past. No inference from past events to what might happen in the future would be permissible. Therefore man could not act. He could at best be a passive spectator and would not be able to make any arrangements for the future, be it only for the future of the impending instant. The first and basic achievement of thinking is the awareness of constant relations among the external phenomena that affect our senses. A bundle of events that are regularly related in a definite way to other events is called a specific thing and as such distinguished from other specific things…. Whatever philosophers may say about causality, the fact remains that no action could be performed by men not guided by it. Neither can we imagine a mind not aware of the nexus of cause and effect. In this sense we may speak of causality as a category or an a priori of thinking and acting."
-Mises```
