Like Plato, Aristotle linked nous to logos (reason) as uniquely human, but he also distinguished nous from logos, thereby distinguishing the faculty for setting definitions from the faculty which uses them to reason with.[23] In his Nicomachean Ethics, Book VI Aristotle divides the soul (psuchē) into two parts, one which has reason and one which does not, but then divides the part which has reason into the reasoning (logistikos) part itself which is lower, and the higher "knowing" (epistēmonikos) part which contemplates general principles (archai). Nous, he states, is the source of the first principles or sources (archai) of definitions, and it develops naturally as people gain experience.[24] This he explains after first comparing the four other truth revealing capacities of soul: technical know how (technē), logically deduced knowledge (epistēmē, sometimes translated as "scientific knowledge"), practical wisdom (phronēsis), and lastly theoretical wisdom (sophia), which is defined by Aristotle as the combination of nous and epistēmē. All of these others apart from nous are types of reason (logos).