by John Marshall Harlan, Kirby v. Lake Shore M. S. Railroad Company…
“ It is undoubtedly true, as announced in adjudged cases, that courts of equity feel themselves bound, in cases of concurrent jurisdiction, by the statutes of limitation that govern courts of law in similar circumstances, and that sometimes they act upon the analogy of the like limitation at law. But these general rules must be taken subject to the qualification that the equity jurisdiction of the courts of the United States cannot be impaired by the laws of the respective states in which they sit. ”
