The seat of the affections or sensibilities, collectively or
   separately, as love, hate, joy, grief, courage, and the like; rarely,
   the seat of the understanding or will; -- usually in a good sense, when
   no epithet is expressed; the better or lovelier part of our nature; the
   spring of all our actions and purposes; the seat of moral life and
   character; the moral affections and character itself; the individual
   disposition and character; as, a good, tender, loving, bad, hard, or
   selfish heart.