He probably experienced the Eleusinian Mysteries as he wrote when describing the sights one viewed at the Eleusinian Mysteries, "to experience is to learn"
hiː pɹˈɑːbəbli ɛkspˈiəɹɪənst ðɪ ᵻluːsˈɪniən mˈɪstɚɹiz æz hiː ɹˈoʊt wɛn dᵻskɹˈaɪbɪŋ ðə sˈaɪts wˈʌn vjˈuːd æt ðɪ ᵻluːsˈɪniən mˈɪstɚɹiz, "tʊ ɛkspˈiəɹɪəns ɪz tə lˈɜːn"