"I can hardly describe the discord produced by the comparison of the retouched part of the painting and the part left untouched, the former having lost entirely the immediacy and brio of the brushwork and the latter the mastery of sensitive and discerning touches.. .For it is true that the more one retouches under the pretext of restoration, the more harm one does, and even the artists themselves, were they able to return, would not able to retouch their painting perfectly on account of the necessary change in the hue of pigments over time... No painting by Titian should be relined, nor any paintings by a number of other painters.. ..and, even when it is possible, the operation is more likely to result in deterioration than in improvement of the painting."

“..As a matter of fact, last winter I was painting on ivory; I've already got a collection of forty studies, but these are original miniatures, of a kind I've never seen before, entirely done with the point of a brush, with details that are closer to the brushwork of Velásquez than to that of Mengs.”

“My dear soul, I can stand on my own feet, but so poorly that I don't know if my head is on my shoulders. I have no appetite or desire to do anything at all. Only your letters cheer me up – only yours. I don't know what will become of me now that I have lost sight of you; I who idolize you have given up hope that you'll ever glance at these blurred lines and get consolation from them.”

“I had established an enviable scheme of life. I refused to dance attendance in the ante-chambers of the great. If anyone wanted something from me he had to ask. I was much run after, but if the person was not of rank, or a friend, I worked for nobody.”

“Since most of the subjects depicted in this work are not real, it is not unreasonable to hope that connoisseurs will readily overlook their defects.”

“The author is convinced that it is as proper for painting to criticize human error and vice as for poetry and prose to do so, although criticism is usually taken to be exclusively the business of literature.”

“letter to Joaquín Ferrer, 20 December 1825; as quoted by Robert Hughes, in: Goya. Borzoi Book - Alfred Knopf, New York, 2003, p. 393”