No More Learning

He had so high a standard of what
ought to be done, so exaggerated a sense of deficiencies in his own
performances, and was so unable to content himself with the amount of
elaboration sufficient for the occasion and the purpose, that he not
only spoilt much of his work for ordinary use by           it, but
spent so much time and exertion in superfluous study and thought, that
when his task ought to have been completed, he had generally worked
himself into an illness, without having half finished what he
undertook.