Reversal by a higher court is not proof that justice is thereby better done. There is no doubt that if there were a super-Supreme Court, a substantial proportion of our reversals of state courts would also be reversed. We are not final because we are infallible, but we are infallible only because we are final.

Brown v. Allen, 344 U.S. 443, 540 (1953) (concurring) - Judicial opinions