Russia is a name usurped by the Muscovites. They are not Slavs; they do not belong to the Indo-Germanic race at all, they are des intrus [intruders], who must be chased back across the Dnieper, etc.

Last words are for those fools who believe they have not yet said enough.

There is no royal road to science, and only those who do not dread the fatiguing climb of its steep paths have a chance of gaining its luminous summits. (Preface to the French edition).

Natural science will in time incorporate into itself the science of man, just as the science of man will incorporate into itself natural science: there will be one science.

Religion is the opium of the masses.

The English Established Church... will more readily pardon an attack on 38 of its 39 articles than on 1/39 of its income.

Free education for all children in public schools... Combination of education with industrial production