Theologian O'Reilly, (The Relations of the Church to Society — Theological Essays, 1882, pg 287):
"There had been anti-popes before from time to time, but never for such a continuance... nor ever with such a following...
The great schism of the West suggests to me a reflection which I take the liberty of expressing here. If this schism had not occurred, the hypothesis of such a thing happening would appear to many chimerical. They would say it could not be; God would not permit the Church to come into so unhappy a situation. Heresies might spring up and spread and last painfully long, through the fault and to the perdition of their authors and abettors, to the great distress too of the faithful, increased by actual persecution in many places where the heretics were dominant. But that the true Church should remain between thirty and forty years without a thoroughly ascertained Head, and representative of Christ on earth, this would not be.
Yet it has been; and we have no guarantee that it will not be again, though we may fervently hope otherwise. What I would infer is, that we must not be too ready to pronounce on what God may permit. We know with absolute certainty that He will fulfill His promises; not allow anything to occur at variance with them; that He will sustain His Church and enable her to triumph over all enemies and difficulties; that He will give to each of the faithful those graces which are needed for each one’s service of Him and attainment of salvation, as He did during the great schism we have been considering, and in all the sufferings and trials which the Church has passed through from the beginning."