Somewhere about the year A.D. 178 Celsus wrote one of the bitterest attacks upon Christianity that was ever written. It was precisely this appeal of Christianity to the common people that he ridiculed. He declared that the Christian point of view was, ‘Let no cultured person draw near, none wise, none sensible; for all that kind of thing we count evil; but if any man is ignorant, if any is wanting in sense and culture, if any is a fool let him come boldly.’

It was precisely this that was the glory of Christianity. In the [Roman] Empire there were sixty million slaves. In the eyes of the law a slave was a ‘living tool,’ a thing and not a person at all. A master could fling out an old slave as he could fling out an old spade or hoe. He could amuse himself by torturing his slaves; he could even kill them. For them there was no such thing as marriage; even their children belonged to the master, as the lambs of the fold belonged not to the sheep but to the shepherd. Christianity made people who were things into real men and women, more into sons and daughters of God; it gave those who had no respect, their self-respect; it gave those who had no life, life eternal; it told men that, even if they did not matter to other men, they still mattered intensely to God. It told men who, in the eyes of the world were worthless, that, in the eyes of God they were worth the death of His only Son. Christianity was, and still is, the most uplifting thing in the whole universe.

–from The Letters to the Corinthians, a commentary by William Barclay, pp. 21 – 22