Quotes:Vladimir Lenin

On revolution
"Without a revolutionary theory there can be no revolutionary movement. This cannot be insisted upon too strongly at a time when the fashionable preaching of opportunism is combined with absorption in the narrowest forms of practical activity." [Emphasis added] —What Is To Be Done?, 1902
"During the lifetime of great revolutionaries, the oppressing classes relentlessly persecute them, and treat their teachings with malicious hostility, the most furious hatred and the most unscrupulous campaign of lies and slanders. After their death, attempts are made to convert them into harmless icons, to canonize them, so to say, and to surround their names with a certain halo for the "consolation" of the oppressed classes and with the object of duping them, while at the same time emasculating the revolutionary doctrine of its content, vulgarizing it and blunting its revolutionary edge." —The State and Revolution, 1917
On Marxism
"The history of philosophy and the history of social science show with perfect clarity that there is nothing resembling 'sectarianism' in Marxism, in the sense of its being a hidebound, petrified doctrine, a doctrine which arose away from the high road of the development of world civilisation. On the contrary, the genius of Marx consists precisely in his having furnished answers to questions already raised by the foremost minds of mankind. His doctrine emerged as the direct and immediate continuation of the teachings of the greatest representatives of philosophy, political economy and socialism.
The Marxist doctrine is omnipotent because it is true. It is comprehensive and harmonious, and provides men with an integral world outlook irreconcilable with any form of superstition, reaction, or defence of bourgeois oppression. It is the legitimate successor to the best that man produced in the nineteenth century, as represented by German philosophy, English political economy and French socialism." [Emphasis added] —The Three Sources and Three Component Parts of Marxism, 1913
On the state
"The state is the product and the manifestation of the irreconcilability class antagonisms. The state arises when, where and to the extent that class antagonisms cannot be objectively reconciled. And, conversely, the existence of the state proves that the class antagonisms are irreconcilable." [Emphasis added] —The State and Revolution, 1917