'Which movement was my favourite; each of them! I cannot make any distinction here. I was perhaps a bit indifferent at the beginning of the first movement. In nay case, only for a short time... From minute to minute I felt warmer and warmer. And it did not leave me for a moment... at the first hearing I perceived so many formal nuances, could always follow the principal line. It was an extraordinary treat for me.'
Arnold Schoenberg to Gustav Mahler, 29 December 1909