Warren saw the US Constitution as the embodiment of American values, and he cared deeply about the ethical implications of the Court's rulings. According to Justice Potter Stewart, Warren's philosophical foundation were the "eternal, rather bromidic, platitudes in which he sincerely believed" and "Warren's great strength was his simple belief in the things we now laugh at: motherhood, marriage, family, flag, and the like." The constitutional historian Melvin I. Urofsky concludes that "scholars agree that as a judge, Warren does not rank with Louis Brandeis, Black, or Brennan in terms of jurisprudence. His opinions were not always clearly written, and his legal logic was often muddled." Other scholars have also reached this conclusion.