In Newman's Own Words

"It was difficult to make out how the Eutychians or Monophysites were heretics, unless Protestants and Anglicans were heretics also; difficult to find arguments against the Tridentine Fathers, which did not tell against the Fathers of Chalcedon; difficult to condemn the Popes of the sixteenth century, without condemning the Popes of the fifth. The drama of religion, and the combat of truth and error, were ever one and the same. The principles and proceedings of the Church now, were those of the Church then; the principles and proceedings of heretics then, were those of Protestants now. I found it so, —almost fearfully; there was an awful similitude, more awful, because so silent and unimpassioned, between the dead records of the past and the feverish chronicle of the present. The shadow of the fifth century was on the sixteenth. It was like a spirit rising from the troubled waters of the old world, with the shape and lineaments of the stern, resolute, overbearing, and relentless; and heretics were shifting, changeable, reserved, and deceitful, ever courting civil power, and never agreeing together, except by its aid; and the civil power was ever aiming at comprehensions, trying to put the invisible out of view, and substituting expediency for faith. What was the use of continuing the controversy, or defending my position, if, after all, I was forging arguments for Arius or Eutyches, and turning devil’s advocate against the much-enduring Athanasius and the majestic Leo? Be my soul with the Saints! and shall I lift up my hand against them? Sooner may my right hand forget her cunning, and wither outright, as his who once stretched it out against a prophet of God! anathema to a whole tribe of Cranmers, Ridleys, Latimers, and Jewels! perish the names of Bramhall, Ussher, Taylor, Stillingfleet, and Barrow from the face of the earth, ere I should do ought but fall at their feet in love and in worship, whose image was continually before my eyes, and whose musical words were ever in my ears and on my tongue!"

-Ven. John Henry Newman in Apologia Pro Vita Sua.