“At the end of 1903, Trotsky was an ardent Menshevik, i.e., he deserted from the Iskrists to the Economists. He said that ‘between the old Iskra and the new lies a gulf’. In 1904-05, he deserted the Mensheviks and occupied a vacillating position, now co-operating with Martynov (the Economist), now proclaiming his absurdly Left ‘permanent revolution’ theory.”
— V.I. Lenin. Collected Works Vol. 20. Moscow: Progress Publishers. 1977. p. 346.