"Energy, confidence, indomitable will, steel rhythm, powerful tone (some times even hard to bear in a small room), a peculiar “epic quality” that scrupulously avoided any suggestion of over-refinement or intimacy (there is none in his music either), yet withal a remarkable ability to convey true lyricism, poetry, sadness, reflection, an extraordinary human warmth, and feeling for nature... were... the principal traits of his pianism. His technique was truly phenomenal, impeccable.... He played quite differently at home than on the concert stage; it was as though he stepped on to the stage clothed not only physically but emotionally in formal dress.... Notwithstanding his outspoken contempt for what is known as “temperamental” performances, he had enough temperament to prevent his playing from sounding dry or emasculated. True, at times he played with such reserve that his performance amounted to a mere exposition; here is my material, he seemed to be saying, understand it and feel it as you please.... The ease (the result of confidence!) with which he tackled some of the most breathtaking passages was truly amazing; he did indeed seem to be “playing” in the literal, almost “sporty” sense of the word (no wonder his enemies called him the “football pianist”). The remarkable clarity and preciseness of the entire musical texture was based on supreme mastery of all the necessary technical media...."
January 1, 1970
https://en.wikiquote.org/wiki/Sergei_Prokofiev