I'll just toss this in, since I haven't seen someone else put it out out there yet:

    Excellence is an art won by training and habituation: we do not act
    rightly because we have virtue or excellence, but we rather have these
    because we have acted rightly;
    
      'these virtues are formed in man by his doing the actions';
    
    we are what we repeatedly do. Excellence, then, is not an act but a habit:
    
      'the good of man is a working of the soul in the way of excellence in
       a complete life... for as it is not one swallow or one fine day that
       makes a spring, so it is not one day or a short time that makes a man
       blessed and happy'
    
        -- Will Durant, "The Story of Philosophy: The Lives and Opinions of
           the World's Greatest Philosophers" (1926), Ch. II: Aristotle and
           Greek Science; part VII: Ethics and the Nature of Happiness