William O. Douglas,
Commissioner of Internal Revenue v…
“ First among those is the expectation that scrupulous adherence by federal courts to the provisions of state law, as reflected both in local statutes and in state court decisions, will promote an appropriate uniformity in the administration of law within each of the States. Uniformity will, in turn, assure proper regard in the federal courts for the areas of law left by the Constitution to state discretion and administration, and, in addition, will prevent the incongruity that stems from dissimilar treatment by state and federal courts of the same or similar factual situations. ”
