Mediocrity is the most effective mask a superior spirit can wear, because to the great majority, which is to say, to the mediocre,it will not suggest a disguise:--and yet it is precisely for their sake that he puts it on--so as not to arouse them, and, indeed, not infrequently to avoid this out of pity and benevolence.
Friedrich NietzscheJust as a waterfall grows slower and more lightly suspended as it plunges down, so the great man of action tends to act with greater calmness than his tempestuous desires prior to the deed would lead one to expect.
Friedrich Nietzsche