"... He could, at will, move you to tears, thrill you with emotion, or make you shiver with excitement. It was no longer a piano he played on, but an entire orchestra, in which power, sweetness, and great execution vied with each other to produce effects totally unlike the efforts of any other single instrumentalist I have ever heard. ... The magnetism he exercised over his audiences was quite extraordinary, and I have seen them roused got such a pitch of excitement and enthusiasm that they could not sit still, but had perforce to rise from their seats to watch as well as listen to him. No one could help being absorbed in his performances; indeed, he was so himself, though perhaps not to the same extent, for any extraneous sound or movement would easily upset him and break the thread of his inspiration,"
January 1, 1970
https://en.wikiquote.org/wiki/Anton_Rubinstein