Aristotle Quote

The soul has two parts, one rational and the other irrational. Let us now similarly divide the rational part, and let it be assumed that there are two rational faculties, one whereby we contemplate those things whose first principles are invariable, and one whereby we contemplate those things which admit of variation.

The Nicomachean Ethics (ed. Wordsworth Editions, 1996) - ISBN: 9781853264610