Jean-Jacques Rousseau

Man is born free, and everywhere he is in chains.
The Social Contract
From whatever aspect we regard the question, the right of slavery is null and void, not only as being illegitimate, but also because it is absurd and meaningless. The words slave and right contradict each other, and are mutually exclusive.
The Social Contract
the Sovereign, being formed wholly of the individuals who compose it, neither has nor can have any interest contrary to theirs; and consequently the sovereign power need give no guarantee to its subjects, because it is impossible for the body to wish to hurt all its members.
The Social Contract
Everything is good as it leaves the hands of the author of things, everything degenerates in the hands of man.
Emile, or On Education
When man is content to be himself he is strong indeed; when he strives to be more than man he is weak indeed.
Emile, or On Education
What man loses by the social contract is his natural liberty and an unlimited right to everything he tries to get and succeeds in getting; what he gains is civil liberty and the proprietorship of all he possesses.
The Social Contract
It is solely on the basis of this common interest that every society should be governed.
The Social Contract
Under bad governments, this equality is only apparent and illusory: it serves only to-keep the pauper in his poverty and the rich man in the position he has usurped. In fact, laws are always of use to those who possess and harmful to those who have nothing: from which it follows that the social state is advantageous to men only when all have something and none too much.
The Social Contract