Full Idea
Only that is a true work of art which transmits fresh feelings not previously experienced by man.
Gist of Idea
True works of art transmit completely new feelings
Source
Leo Tolstoy (What is Art? [1898], Ch.9)
Book Reference
Tolstoy,Leo: 'What is Art? and Essays on Art', ed/tr. Maude,A [OUP 1975], p.149
A Reaction
I think a great composer will probably not have any new feelings at all, but will discover new expressions which contain feelings by which even they are surprised (e.g. the Tristan chord).