They define an infirmity of mind as “a vigorous opining that some object is worthy of pursuit which is in fact not worthy of pursuit, that opinion being deeply attached and rooted in the mind.” The state arising from aversion they define as “a vigorous opinion, deeply attached and rooted, that some object is worthy of avoidance which is in fact not worthy of avoidance.” “Opining” is when a person judges that he knows something which he does not in fact know.
