From the article, a quote by St. Augustine:

Usually even a non-Christian knows something about the earth, the heavens and the other elements of this world, about the motions of the stars and even their size and relative positions, about the predictable eclipses of the sun and moon, the cycles of the years and the seasons, about the kinds of animals, shrubs, stones and so forth, and this knowledge he holds to as being certain from reason and experience.

Now it is a disgraceful and dangerous thing for an infidel to hear a Christian, presumably giving the meaning of Holy Scripture, talking nonsense on these topics… If they find a Christian mistaken in a field in which they themselves know well and hear him maintain his foolish opinions about our books, how are they going to believe those books and matters concerning the resurrection of the dead, the hope of eternal life, and the kingdom of heaven when they think their pages are full of falsehoods on facts which they themselves have learned from experience in the light of reason?