Liberalism is the philosophy of the individual. Its ethic is liberty and its characteristic is autonomy — the freedom of the will from external constraint. It says "I shall…".
Socialism is the philosophy of the state. Its ethic is equality and its characteristic is coercion — the power, in the last resort, to exert force over individuals and groups. It says "you must…".
Conservatism is the philosophy of society. Its ethic is fraternity and its characteristic is authority — the non-coercive social persuasion which operates in a family or a community. It says "we should…".

"Triangulation", p. 13 - On Fraternity : Politics Beyond Liberty & Equality (2007)