The structure of cities, the architecture of houses, squares, gardens, public walks, gateways, railway stations, etc – all these provide us with the … - Giorgio de Chirico

..can you [contemporary painters] ever get close, even vaguely, to the solidity, the transparency, the lyric strength of colour, to the clarity, the mystery, the emotion of any of the paintings of Fra Angelico, Piero della Francesca, Botticelli, Dürer, Holbein or of young Raphael? Friends, have you ever realized that with the oil colours used today this is absolutely impossible?. ..In the museums of Europe I have observed the work of the Flemish painters at length – those earlier, later as well as contemporary to the [brothers] Van Eycks – and I am convinced that the above mentioned brothers were not the discoverers of oil paint in its true sense, as is held today, but that what they did was introduce oil in emulsion with other substances, especially live and fossil resins, into so-called oil tempera emulsion, which was already known in the Flanders, to enable them through the use of veiling to give a greater finish, cleanliness and strength of colour to their painting.
'These oils which are their tempera' said Vasari, speaking of the Flemish [painters] in his Life of Antonello; and without doubt he was alluding to Flemish oil tempera emulsion, but it is sure, absolutely sure, that.. ..we are dealing with.. ..a tempera based mixture (egg, glue, resin, tempera etc) in which oil was only used as a means of unity and for the finish of the painting.

Dear Mr. Rosenberg - I was very surprised this morning that you refused to give me 2,000 fr. especially given that I had told you that my wife was gravely ill in Berlin and that I needed to leave immediately. You probably thought it was a tale I was telling you in order to shave some money off the sum that you owe me; to prove to you that this is not the case, I enclose with this letter a telegram that I received this morning. Strong though the crisis may be and as strongly as you may have applied the brakes, it is not possible that you are not able to find 1,000 fr. for a painter with whom you have done business for six years now and who (I dare hope) enjoys all your esteem; especially given that the said painter tells you that his wife is seriously ill and that he needs to leave.
I should tell you that in general the way you act in these times of crises is not particularly heroic.

..I will endeavour to make clear to men of good will what the word 'material' means with regard to painting and that, without the material substance of paint, a painting is not a work of art but merely a decorative object, or rather, if it deals with an invented painting, the value of the image resides in its spiritual content.
In order to be a work of art, a painting must be very well painted and the good quality of the paint depends completely on the material substance of the paint with which it is executed. This matter, which constitutes the substance of painting, is composed of two elements which are equally important and absolutely inseparable: physical substance and metaphysical substance. These two elements complete each other reciprocally and when they are of a superior quality, create a masterpiece by way of their absolute harmony.