His writings are divisible into two groups: the "exoteric", intended for the public, and the "esoteric", for use within the Lyceum school.
hɪz ɹˈaɪɾɪŋz ɑːɹ dᵻvˈɪzᵻbəl ˌɪntʊ tˈuː ɡɹˈuːps: ðə "ɛɡzoʊtˈɛɹɪk", ɪntˈɛndᵻd fɚðə pˈʌblɪk, ænd ðə "ˌɛsoʊtˈɛɹɪk", fɔːɹ jˈuːs wɪðˌɪn ðə laɪsˈiːəm skˈuːl.