" There are nearly always residual phenomena, a partial hanging-back. When an open-handed Maecenas surprises us by some isolated trait of miserliness, or when a person who is consistently over-kind suddenly indulges in a hostile action, such 'residual phenomena' are invaluable for genetic research. They show us that these praise-worthy and precious qualities are based on compensation and overcompensation which, as was to have been expected, have not been absolutely and fully successful. "