..he [= Michelangelo] was a good man, but he did not know how to paint.
Notes from Wikiquote
Quote of El Greco's response, when he was later asked what he thought about the Italian artist Michelangelo
I am neither bound to say why I came to this city nor to answer the other questions put to me.
I hold the imitation of colour to be the greatest difficulty of art.
Quote text and notes from Wikiquote: El Greco (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.