“The offshoots of human mental efforts, the ideas and the judgments of value that direct the individuals' actions, cannot be traced back to their causes, and are in this sense ultimate data. In dealing with them we refer to the concept of individuality. But in resorting to this notion we by no means imply that ideas and judgments of value spring out of nothing by a sort of spontaneous generation and are in no way connected and related to what was already in the universe before their appearance. We merely establish the fact that we do not know anything about the mental process which produces within a human being the thoughts that respond to the state of his physical and ideological environment.”

Excerpt From

Theory and History

Ludwig von Mises