“I know that some people say the idea of a Law of Nature or decent behavior known to all men is unsound, because different civilisations and different ages have had quite different moralities.
But this is not true. There have been difference between their moralities, but these have never amounted to anything like a total difference. If anyone will take the trouble to compare the moral teaching, of, say, the ancient Egyptians, Babylonians, Hindus, Chinese, Greeks, and Romans, what will really strike him will be how very like they are to each other and to our own … for our present purpose, I need only ask the reader to think what a totally different morality would mean. Think of a country where people were admired for running away in battle, or where a man felt proud of double-crossing all the people who had been kindest to him. You might just as well try to imagine a country where two and two made five. Men have differed as regards what people you ought to be unselfish to – whether it was only your own family, or your fellow countrymen, or every one. But they have always agreed that you ought not to put yourself first. Selfishness has never been admired. Men have differed as to whether you should have one wife or four. But they have always agreed that you must not simply have any woman you liked.
But the most remarkable thing is this. Whenever you find a man who says he does not believe in a real Right and Wrong, you will find the same man going back on this a moment later.