All satisfaction, or what is commonly called happiness, is, in reality and essence, negative only . . . . We are not properly conscious of the blessings and advantages we actually possess, nor do we prize them, but think of them merely as a matter of course, for they gratify us only negatively, by restraining suffering. Only when we have lost them do we become sensible of their value; for the want, the privation, the sorrow, is the positive thing, communicating itself directly to us
