He next likens our teacher to one suffering from ophthalmia, and his disciples to those suffering from the same disease, and says that “such an one among a company of those who are afflicted with ophthalmia, accuses those who are sharp-sighted of being blind.” Who, then, would we ask, O Greeks, are they who in our judgment do not see, save those who are unable to look up from the exceeding greatness of the world and its contents, and from the beauty of created things, and to see that they ought to worship, and admire, and reverence Him alone who made these things, and that it is not befitting to treat with reverence anything contrived by man, and applied to the honour of God, whether it be without a reference to the Creator, or with one? For, to compare with that illimitable excellence, which surpasses all created being, things which ought not to be brought into comparison with it, is the act of those whose understanding is darkened.
We do not then say that those who are sharp-sighted are suffering from ophthalmia or blindness; but we assert that those who, in ignorance of God, give themselves to temples and images, and so-called sacred seasons, are blinded in their minds, and especially when, in addition to their impiety, they live also in licentiousness, not even inquiring after any honourable work whatever, but doing everything that is of a disgraceful character.
Source: Against Celsus (New Advent)