[t]he difference of quality is considerable. There were great master-craftsmen and there were provincial hacks. There were those who summarily performed a routine, and there were others (surprisingly many in fact) who offered hospitality to the soul of their client. Yet the pictorial choices open to the painter were minute; the prescribed form very strict. This is paradoxically why, before the greatest of them, one is aware of enormous painterly energy. The stakes were high, the margin narrow. And in art these are conditions which make for energy.
I get the feeling this is going be a good read

