In all of human history no country or no people have suffered such terrible slavery, conquest and foreign oppression and no country and no people have struggled so strenuously for their emancipation than Sicily and the Sicilians.

Philosophy stands in the same relation to the study of the actual world as masturbation to sexual love.

Surplus-value and the rate of surplus-value are... the invisible essence to be investigated, whereas the rate of profit and hence the form of surplus-value as profit are visible surface phenomena

Surround yourself with people who make you happy. People who make you laugh, who help you when you’re in need. People who genuinely care. They are the ones worth keeping in your life. Everyone else is just passing through.

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).

There is no greater stupidity than for people...to marry and so surrender themselves to the small miseries of domestic and private life.

Anyone who knows anything of history knows that great social changes are impossible without feminine upheaval. Social progress can be measured exactly by the social position of the fair sex, the ugly ones included.