The painter should aim at universality, because there is a great
want of self-respect in doing one thing well and another badly, as
many do who study only the [rules of] measure and proportion in the
nude figure and do not seek after variety; for a man may be well
proportioned, or he may be fat and short, or tall and thin, or
medium. And a painter who takes no account of these varieties always
makes his figures on one pattern so that they might all be taken for
brothers; and this is a defect that demands stern reprehension.
504.