No human acquisition is stable. Even what appears to us most completely won and consolidated can disappear in a few generations. This thing we call "civilization" - all these physical and moral comforts, all these conveniences, all these shelters, all these virtues and disciplines which have become habit now, on which we count, and which in effect constitute a repertory or system of securities which man made for himself like a raft in the initial shipwreck which living always is - all these securities are insecure securities which in the twinkling of an eye, at the least carelessness, escape from man's hands and vanish like phantoms.