WHAT is easier than slipping, or letting things slip? We need not do anything to slip. On the edge of a stair, on an icy path, on a fruit-skin that has been carelessly thrown upon the pavement, on the polished floor of a room in which we spend half our time, we may slip and become cripples for life, if we live to be cripples. Or if it is not we that slip, a bit of food slipping may strangle us; a sharp knife slipping may cut an artery; a valued possession slipping may be lost to us; a priceless opportunity for doing or getting good may pass away beyond recovery. What one of the great movements of our life is in itself less noticeable than drifting?