“It is on account of theology alone that any assertion whatsoever should be called catholic or heretical.”

— William of Ockham

Vol. I, Book 1, Ch. 2 http://www.britac.ac.uk/pubs/dialogus/t1d1.html, as translated by John Kilcullen and John Scott (2003).
Dialogus (1494)
Context: It is on account of theology alone that any assertion whatsoever should be called catholic or heretical. For only an assertion which is consonant with theology is truly catholic, and only one which is known to be opposed to theology is known to be heretical. For if some assertion were found to be opposed to decrees of the highest pontiffs, or also of general councils or also to laws of the emperors, nevertheless, if it were not in conflict with theology, even if it could be considered false, erroneous or unjust, it should not be counted as a heresy.

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William of Ockham 13

medieval philosopher and theologian 1285–1349

Roger Haight (1936) American theologian

Source: Dynamics Of Theology, Chapter Ten, Method in theology, p. 192

“The first Presbyterian was a heretic. The first Baptist was a heretic. The first Congregationalist was a heretic. The first Christian was denounced as a blasphemer. And yet these heretics, the moment they get numerous enough to be in the majority in some locality, begin to call themselves orthodox. Can there be any impudence beyond this?”

Robert G. Ingersoll (1833–1899) Union United States Army officer

My Reviewers Reviewed (lecture from June 27, 1877, San Francisco, CA)

“Purely philosophical assertions which do not pertain to theology should not be solemnly condemned or forbidden by anyone, because in connection with such [assertions] anyone at all ought to be free to say freely what pleases him.”

William of Ockham (1285–1349) medieval philosopher and theologian

Vol. I, Book 2, Ch. 22 http://www.britac.ac.uk/pubs/dialogus/t1d2b.html, as translated by John Scott (1999)
Dialogus (1494)

“Theology, sir, is a fortress; no crack in a fortress may be accounted small.”

Arthur Miller The Crucible

John Hale
The Crucible (1953)

“They never understand the loveliness and the beauty of this thing that we call human existence. You know — all mystics — Catholic, Christian, non-Christian, no matter what their theology, no matter what their religion — are unanimous on one thing: that all is well, all is well.”

Anthony de Mello (1931–1987) Indian writer

As quoted in Approaching God : How to Pray (1995) by Steve Brown, p. 94
Context: Spirituality means waking up. Most people, even though they don't know it, are asleep. They're born asleep, they live asleep, they marry in their sleep, they breed children in their sleep, they die in their sleep without ever waking up. They never understand the loveliness and the beauty of this thing that we call human existence. You know — all mystics — Catholic, Christian, non-Christian, no matter what their theology, no matter what their religion — are unanimous on one thing: that all is well, all is well. Though everything is a mess, all is well. Strange paradox, to be sure. But, tragically, most people never get to see that all is well because they are asleep. They are having a nightmare.