Tchaikovsky’s situation is very clearly shown in four letters written to his sister about this period, each letter corresponding with one of the four phases of his evolution. These letters throw a clear light upon the chief psychological moments of these two eventful years of his life. The first, dated October 23rd (November 4th), 1861, has been already quoted. Tchaikovsky just mentions in the postscript that he has begun his musical studies as a matter of no importance whatever--and that in itself is very enlightening. At that moment his harmony lessons with Zaremba were only a detail in the life of a man of the world, as were the Italian conversation lessons he was taking at the same time. His chief interest was still his official career, and most of his leisure was still given up to social enjoyment. The second letter shows matters from a somewhat different point of view. Although only written a few weeks later, it puts his musical studies in a new light. On December 4th (16th), 1861, Tchaikovsky writes:-- “I am getting on well. I hope soon to get a rise, and be appointed ‘clerk for special duty.’ I shall get an additional twenty roubles to my salary and less work. God grant it may come to pass!... I think I have already told you that I have begun to study the theory of music with success. You will agree that, with my rather exceptional talents (I hope you will not mistake this for bragging), it seems foolish not to try my chances in this direction. I only dread my own easy-going nature. In the end my indolence will conquer: but if not, I promise you that I shall do something. Luckily it is not yet too late.” Between the second and third letters eight months elapsed. During this period Peter Ilich had to refute his self-condemnation as regards indolence, and to prove that it actually “was not yet too late” to accomplish something. I recollect having made two discoveries at this time which filled me with astonishment. The first was that the two ideas “brother Peter” and “work” were not necessarily opposed; the second, that besides pleasant and interesting music, there existed another kind, exceedingly unpleasant and wearisome, which appeared nevertheless to be the more important of the two. I still remember with what persistency Peter Ilich would sit at the piano for hours together playing the most “abominable” and “incomprehensible” preludes and fugues.... My astonishment knew no bounds when he informed me he was writing exercises. It passed my understanding that so charming a pastime as music should have anything in common with the mathematical problems we loathed. Outwardly Peter Ilich’s life underwent one remarkable change. Of all his friends and acquaintances he now only kept up with Apukhtin and Adamov.