Chapter XXXV: Section 2: Internal Trials of the Church

[Sidenote: Heresy gathers strength in prosperity,]

The Church being thus firmly settled and delivered from outer enemies, was now to find troubles within. Even from the days of St. John the Divine heresies respecting the Person of our Blessed Lord had been rife; but these open denials of the Divinity of the Great Head of the Church had been successfully opposed without their leaving behind them any very lasting trace. [Sidenote: and is of a more dangerous nature.] Errors of a more subtle class followed, amounting in reality to unbelief in our Saviour's Godhead, but expressing that unbelief by assailing the teaching of the Church respecting His nature as Very God or as Very Man.

[Sidenote: Arianism.]

This species of error culminated in the heresy of Arius, who denied that the Second Person of the Holy Trinity was co-equal, co-eternal, and of One Substance with the Father, and whose false teaching was more widely listened to and followed than that of any of his predecessors in misbelief. Arianism, and various forms of error consequent upon it, long afflicted the Church, especially in the East, and the Emperor Constantine himself seems at one time to have had a leaning towards the theories of Arius.

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