Norwest Bank Worthington v. Ahlers, 485 U.S. 197, 206, 108 S.Ct. 963, 99 L.Ed.2d 169 (1988); accord, SEC v. United States Realty & Improvement Co., 310 U.S. 434, 455, 60 S.Ct. 1044, 84 L.Ed. 1293 (1940) (A bankruptcy court . . . is guided by equitable doctrines and principles except in so far as they are inconsistent with the Act).