William O. Douglas,
Arkansas v. Texas — Opinion of the Court
“ But where, as here, we are concerned with a question of Texas law in which the courts of that State necessarily 'have the final say' the only basis for our holding the suit is to ride herd on the Texas court, on the assumption that it may deny Arkansas some federal right. We ought not to entertain such a possibility in the administration of justice of one state against a sister state. Of course Arkansas will get justice in Texas, just as Texas would get justice in Arkansas. ”
