In the first place, lawyers better remember they are human beings, and a human being who hasn't his periods of doubts and distresses and disappointments must be a cabbage, not a human being. That is number one.
Harvard University. Harvard Law School Association. Council, Felix Frankfurter (1960). “Proceedings in honor of Mr. Justice Frankfurter and distinguished alumni at the meeting of the Council, Harvard Law School Association in Cambridge, April 30, 1960”