"The larger society to which I here contrast the human "pocket" may not exist according to some people, and at any rate we have no experience of it. We do not meet angels, or unfallen races. But we can get some inkling of the truth even inside our own race. Different ages and cultures can be regarded as "pockets" in relation to one another. I said, a few pages back, that different ages excelled in different virtues. If, then, you are ever tempted to think that we modern Western Europeans cannot really be so very bad because we are, comparatively speaking, humane - if, in other words, you think God might be content with us on that ground - ask yourself whether you think God ought to have been content with the cruelty of cruel ages because they excelled in courage or chastity. You will see at once that this is an impossibility. From considering how the cruelty of our ancestors looks to us, you may get some inkling how our softness, worldliness, and timidity would have looked to them, and hence how both must look to God."
C.S. Lewis - The Problem of Pain