Hippocrates, Epistula ad Ptolemaeum regem de hominis fabrica. F. Z. Ermins, Anecdota medica Graeca, Leiden 1840, pp. 279-297. Inc. Συνέστηκεν ὁ κόσμος ἐκ τεσσάρων στοιχείων.
Extracts from Ioannes Moschos, Pratum Spirituale, Peter I, Bishop of Alexandria (can. 15; PG 18.508B8-C1), Nicolas I, Patriarch of Constantinople, etc.