“The state of spiritual folly is, I suppose, one of the most universal evils in the world. For the number of those who are naturally foolish is exceedingly great; of those, I mean, who understand no worldly thing well; of those who are careless about everything, carried about by every breath of opinion, without knowledge, and without principle.
“But the term spiritual folly includes, unhappily, a great many more than these; it takes in not those only who are in the common sense of the term foolish, but a great many who are in the common sense of the term clever, and many who are even in the common sense of the terms, prudent, sensible, thoughtful, and wise. It is but too evident that some of the ablest men who have ever lived upon earth, have been in no less a degree spiritually fools.
“And thus, it is not without much truth that Christian writers have dwelt upon the insufficiency of worldly wisdom, and have warned their readers to beware, lest, while professing themselves to be wise, they should be accounted as fools in the sight of God.”
– Thomas Arnold (Lecture IV, “The Christian Life”)