On the other hand, in dealing with the problem of bringing his heterodox system into conformity with the regula fidei he evinced a high degree of technical skill.
The heterodox Eastern churches also have their synaxaria.
His heterodox opinions regarding the doctrine of the Trinity drew upon his works the condemnation of the church.
It was the excitement caused by their attempt, and the heterodox conclusions which were its first result, that lifted these Scholastic disputations into the central position which they henceforth occupied in the life of the middle ages.
The eminent teachers of the time are said to have been Aristo, Zeno's heterodox pupil, and Arcesilas, who in Plato's name brought Megarian subtleties and Pyrrhonian agnosticism to bear upon the intruding doctrine; and after a vigorous upgrowth it seemed not unlikely to die out.
The only ancient writers who mention him are Gennadius, presbyter of Massilia (end of 5th century), in his De scriptoribus ecclesiasticis, and Pope Gelasius in De libris recipiendis et non recipiendis, in which his works are classed as Apocryphi, probably on account of certain heterodox statements contained in them.
The archimandrite Eutyches having been deposed by his bishop, Flavianus of Constantinople, on account of his heterodox doctrine of the person of Christ, had appealed to Dioscurus, the successor of Cyril in the see of Alexandria, who restored him and moved the emperor Theodosius II.
Their religious teachers detested the native Mahommedan princes for their religious indifference, and gave Yusef a fetwa - or legal opinion - to the effect that he had good moral and religious right to dethrone the heterodox rulers who did not scruple to seek help from the Christians whose bad habits they had adopted.
The heterodox movements in Italy in the 13th and 14th centuries, such as those of the Segarellists, Dolcinists, and Fraticelli of every description, were penetrated with Joachimism; while such independent spirits as Roger Bacon, Arnaldus de Villa Nova and Bernard Dblicieux often comforted themselves with the thought of the era of justice and peace promised by Joachim.
The heterodox views which he maintained aroused the anger of the Church on behalf of its cherished Aristotelianism, and a short time after his death his books were placed on the Index.