We repudiate all morality which proceeds from supernatural ideas or ideas which are outside the class conception. In our opinion, morality is entirely subordinate to the interests of the class war; everything is moral which is necessary for the annihilation of the old exploiting social order and for uniting the proletariat. Our morality consists solely in close discipline and conscious warfare against the exploiters.

Vladimir Ilich Lenin (1870-1924) Russian politician, revolutionary, political theorist [b. Vladimir Ilich Ulyamov]

(Attributed)
    (Source)

Quoted in René Fülöp-Miller, Lenin and Gandhi (1927).