Vladimir Illyich Lenin: Testament, 1922
Comrade Stalin, having become Secretary-General, has unlimited authority concentrated in his hands, and I am not sure whether he will always be capable of using that authority with sufficient caution. Comrade Trotsky, on the other hand, as his struggles against the C.C. on the question of the People’s Commissariat for Communications has already proved, is distinguished not only by outstanding ability. He is personally perhaps the most capable man in the present C.C., but he has displayed excessive self-assurance and shown excessive preoccupation with the purely administrative side of the work.
These two qualities of the two outstanding leaders of the present C.C. can inadvertently lead to a split, and if our Party does not take steps to avert this, the split may come unexpectedly.
I shall not give any further appraisals of the personal qualities of other members of the C.C. I shall just recall that the October episode with Zinoviev and Kamenev was, of course, no accident, but neither can the blame for it be laid upon them personally, any more than non-Bolshevism can upon Trotsky.
Speaking of the young C.C. members, I wish to say a few words about Bukharin and Pyatakov. They are, in my opinion, the most outstanding figures (among the younger ones), and the following must be borne in mind about them: Bukharin is not only a most valuable and major theorist of the Party; he is also rightly considered the favorite of the whole Party, but his theoretical views can be classified as fully Marxist only with the great reserve, for there is something scholastic about him (he has never made a study of dialectics, and, I think, never fully appreciated it).
December 25. As for Pyatakov, he is unquestionably a man of outstanding will and outstanding ability, but shows far too much zeal for administrating and the administrative side of the work to be relied upon in a serious political matter.
Both of these remarks, of course, are made only for the present, on the assumption that both these outstanding and devoted Party workers fail to find an occasion to enhance their knowledge and amend their one-sidedness.
Lenin, 24 December 1922
Stalin is too rude and this defect, although quite tolerable in our midst and in dealing among us Communists, becomes intolerable in a Secretary-General. That is why I suggest the comrades think about a way of removing Staling from that post and appointing another man in his stead who in all other respects differs from Comrade Stalin in having only one advantage, namely, that of being more tolerant, more loyal, more polite, and more considerate to the comrades, less capricious, etc. This circumstance may appear to be a negligible detail. But I think that from the standpoint of safeguards against a split, and from the standpoint of what I wrote above about the relationship between Stalin and Trotsky, it is not a detail, or it is a detail which can assume decisive importance.
Lenin, 25 December 1922