Chesterton, from Heretics:
“The real difference between Paganism and Christianity is perfectly summed up in the difference between the pagan, or natural, virtues, and those three virtues of Christianity which the Church of Rome calls virtues of grace. The pagan, or rational, virtues are such things as justice and temperance, and Christianity has adopted them. The three mystical virtues which Christianity has not adopted, but invented, are faith, hope, and charity.
Now much easy and foolish Christian rhetoric could easily be poured out upon those three words, but I desire to confine myself to the two facts which are evident about them. The first evident fact (in marked contrast to the delusion of the dancing pagan)—the first evident fact, I say, is that the pagan virtues, such as justice and temperance, are the sad virtues, and that the mystical virtues of faith, hope, and charity are the gay and exuberant virtues. And the second evident fact, which is even more evident, is the fact that the pagan virtues are the reasonable virtues, and that the Christian virtues of faith, hope, and charity are in their essence as unreasonable as they can be.”