Summary

Giorgio Vasari Lives of the Most Excellent Painters… (1850)

Thus becoming old, he constantly declined more and more, departing to such an extent from the excellence of his first manner, that the works he produced no longer seemed to be by his own hand: daily forgetting somewhat of his art, he descended at length to painting, not the ordinary frescoes and oil paintings of his profession only, but all sorts of things, even the meanest.
Source: Wikisource

Giorgio Vasari Lives of the Most Excellent Painters… (1850)

But the causes of many an appearance as well in art as in nature are totally unknown to us, nor can the same rule be always successfully applied to what may appear to be similar cases; a state of things by which the human judgment is often rendered uncertain in its decisions: nay, men are not unfrequently compelled to admit themselves wholly at fault, as was manifest in the instance of Raffaellino del Garbo.
Source: Wikisource

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