Now, the causes being four, it is the business of the student of nature to know about them all, and if he refers his problems back to all of them, he will assign the "why" in the way proper to his science-the matter, the form, the mover, that for the sake of which.
Aristotle, (2014). “Complete Works of Aristotle, Volume 1: The Revised Oxford Translation”, p.338, Princeton University Press
