What the scientific doctrine of evolution really implies is something much more weighty and sinister than frothy optimism. When a preacher now quotes Paul, "as in Adam all die," not many of the younger generation understand him, but when we are told that we came out of low, sub-human beginnings, that we carry with us yet the bestial leftovers of an animal heritage to be fought against and overcome and left behind, well-instructed members of this generation ought to comprehend. Yet in saying that, we are dealing with the same fundamental fact which Paul was facing when he said, "as in Adam all die"; we are handling the same unescapable experience out of which the old doctrine of original sin first came; we are facing a truth which it will not pay us to forget: that humanity's sinful nature is not something which you and I alone make up by individual deeds of wrong, but that it is an inherited mortgage and handicap on the whole human family. Why is it that if we let a field run wild it goes to weeds, while if we wish wheat we must fight for every grain of it? Why is it that if we let human nature run loose it goes to evil, while he who would be virtuous must struggle to achieve character? It is because, in spite of our optimisms and evasions, that fact still is here, which our fathers often appraised more truly than we, that human nature, with all its magnificent possibilities, is like the earth's soil filled with age-long seeds and roots of evil growth, and that progress in goodness, whether personal or social, must be achieved by grace of some power which can give us the victory over our evil nature. In past generations it was the preachers who talked most about sin and thundered against it from their pulpits, but now for years they have been very reticent about it. Others, however, have not been still. Scientists have made us feel the ancient heritage that must be fought against; novelists have written no great novel that does not swirl around some central sin; the work of the dramatists from Shakespeare until Ibsen is centrally concerned with the problem of human evil; and now the psycho-analysts are digging down into the unremembered thoughts of men to bring up into the light of day the origins of our spiritual miseries in frustrated and suppressed desire. We do not need artificially to conjure up a sense of sin. All we need to do is to open our eyes to facts. Take one swift glance at the social state of the world to-day. Consider our desperate endeavours to save this rocking civilization from the consequences of the blow just delivered it by men's iniquities. That should be sufficient to indicate that this is no fool-proof universe automatically progressive, but that moral evil is still the central problem of mankind.