It’s great that our “post-modern” questions regarding truth began far before “modern-ism”. It would appear that the scholars of Augustine’s day (1600+ years ago) were afraid to affirm anything for fear of error:
Disputed Questions about the Limits
of Knowledge and Certainty in Various Matters
20. I do not rightly know whether [misperceptions] should be called sins–when one thinks well of a wicked man, not knowing what his character really is, or when, instead of our physical perception, similar perceptions occur which we experience in the spirit (such as the illusion of the apostle Peter when he thought he was seeing a vision but was actually being liberated from fetters and chains by the angel) Or in perceptual illusions when we think something is smooth which is actually rough, or something sweet which is bitter, something fragrant which is putrid, that a noise is thunder when it is actually a wagon passing by, when one takes this man for that, or when two men look alike, as happens in the case of twins–whence our poet speaks of “a pleasant error for parents”–I say I do not know whether these and other such errors should be called sins.
Nor am I at the moment trying to deal with that knottiest of questions which baffled the most acute men of the Academy, whether a wise man ought ever to affirm anything positively lest he be involved in the error of affirming as true what may be false, since all questions, as they assert, are either mysterious [occulta] or uncertain. On these points I wrote three books in the early stages of my conversion because my further progress was being blocked by objections like this which stood at the very threshold of my understanding. It was necessary to overcome the despair of being unable to attain to truth, which is what their arguments seemed to lead one to. Among them every error is deemed a sin, and this can be warded off only by a systematic suspension of positive assent. Indeed they say it is an error if someone believes in what is uncertain. For them, however, nothing is certain in human experience, because of the deceitful likeness of falsehood to the truth, so that even if what appears to be true turns out to be true indeed, they will still dispute it with the most acute and even shameless arguments.
Among us, on the other hand, “the righteous man lives by faith.” Now, if you take away positive affirmation, you take away faith, for without positive affirmation nothing is believed. And there are truths about things unseen, and unless they are believed, we cannot attain to the happy life, which is nothing less than life eternal. It is a question whether we ought to argue with those who profess themselves ignorant not only about the eternity yet to come but also about their present existence, for they [the Academics] even argue that they do not know what they cannot help knowing. For no one can “not know” that he himself is alive. If he is not alive, he cannot “not know” about it or anything else at all, because either to know or to “not know” implies a living subject. But, in such a case, by not positively affirming that they are alive, the skeptics ward off the appearance of error in themselves, yet they do make errors simply by showing themselves alive; one cannot err who is not alive. That we live is therefore not only true, but it is altogether certain as well. And there are many things that are thus true and certain concerning which, if we withhold positive assent, this ought not to be regarded as a higher wisdom but actually a sort of dementia…
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Handbook on Faith, Hope, and Love
Saint Augustine
Translated by Albert C. Outler