Really great moral teachers never do introduce new moralities: it is quacks and cranks who do that.
C. S. LewisA man who was merely a man and said the sort of things Jesus said would not be a great moral teacher. He would either be a lunatic - on a level with the man who says he is a poached egg - or else he would be the Devil of Hell. You must make your choice. Either this man was, and is, the Son of God; or else a madman or something worse. You can shut him up for a fool; you can spit at him and kill him as a demon; or you can fall at his feet and call him Lord and God. But let us not come with any patronizing nonsense about his being a great human teacher. He has not left that open to us.
C. S. LewisA woman means by Unselfishness chiefly taking trouble for others; a man means not giving trouble to others...thus, while the woman thinks of doing good offices and the man of respecting other people's rights, each sex, without any obvious unreason, can and does regard the other as radically selfish.
C. S. LewisThere is something in natural affection which will lead it on to eternal love more easily than natural appetite could be led on. But there's also something in it which makes it easier to stop at the natural level and mistake it for the heavenly. Brass is mistaken for gold more easily than clay is. And if it finally refuses conversion its corruption will be worse than the corruption of what ye call the lower passions. It is a stronger angel, and therefor, when it falls, a fiercer devil.
C. S. Lewis