In spite of the Psalmist's warning that threescore years and ten are the years of man and that life beyond that is likely to be filled with all sorts of discomforts, practically all men are anxious to live long lives. They are satisfied to take the diseases of advanced years provided only there are surceases from pain at intervals and they are able to occupy themselves for some part of the time with their usual interests. It is true that a certain sadly increasing number in our time shorten existence by their own hand, and at an ever younger age on the average and that some at least of those who do so are not insane in any justifiable legal sense of the word, but they are felt by all to be unfortunate exceptions who prove that the rule of love of life and desire to cling to it through sad and evil case is practically universal among men. Life may be, in the words of the cynic, a chronic disease, whose termination is always death, but most men prefer that the disease should last as long as possible. The most important factor for long life is of course heredity. The man who wants to live long should have been careful to be born of long-lived parents and grandparents. Doctor Oliver Wendell Holmes once said that the physician would often like to be in the position to treat in the persons of his patient's grandparents a {295} number of the diseases that he sees in his consulting room. Whatever truth there may be in that, there is no doubt at all that there is very little hope of a man living long if his parents and grandparents have been short-lived, unless of course their taking off has been due to accident. After family heredity, however, undoubtedly the most important factor for longevity is an abiding sense of religion. A great many religious people live beyond the average age, and a great many clergymen live to be very old men and yet retain their faculties and physical powers very well. They are not longer lived than other professional men on the average, because many of those who become clergymen are delicate by nature and only rarely so robust as other college men. In recent years the insurance companies have come to recognize very clearly what is called the moral hazard in life. A man who lives a quiet, simple life without excesses in eating or drinking, getting his full quota of sleep and his meals regularly without temptations to high living of various kinds is much more likely to outlive his mathematical average of expectancy in life than the man who does not follow that sort of existence.