"Upon the presumption that the legislature does not intend what is unjust, rests the leaning against giving certain statutes a retrospective operation. They are construed as operating only in cases or on facts which come into existence after the statutes were passed unless a retrospective effect is clearly intended."
"The passage quoted is germane because it reveals an assumption that a person newly qualified for relief may have that relief assessed in terms of events occurring before the relief became available."