Vladimir I. Lenin - The Tasks of the Proletariat in the Present Revolution ("The April Theses").
Published on April 7, 1917 in Pravda No. 26.
Source: Lenin’s Collected Works, Progress Publishers, 1964, Moscow, Volume 24, pp. 19-26. via Marxists Internet Archives.
I did not arrive in Petrograd until the night of April 3, and therefore at the meeting on April 4, I could, of course, deliver the report on the tasks of the revolutionary proletariat only on my own behalf, and with reservations as to insufficient preparation.
The only thing I could do to make things easier for myself—and for honest opponents—was to prepare the theses in writing. I read them out, and gave the text to Comrade Tsereteli. I read them twice very slowly: first at a meeting of Bolsheviks and then at a meeting of both Bolsheviks and Mensheviks.
I publish these personal theses of mine with only the briefest explanatory notes, which were developed in far greater detail in the report.