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One of the most famous statements on pluralism of values was made by Isaiah Berlin. Berlin believed that one of the most disastrous mistakes in human history was the belief that there was one single solution to the problems of social organization based on one single ultimate value.
To admit that the fulfilment of some of our ideals may in principle make the fulfilment of others impossible is to say that the notion of total human fulfilment is a formal contradiction, a metaphysical chimera….The world that we encounter in ordinary experience is one in which we are faced with choices between ends equally ultimate, and claims equally absolute, the realization of some of which must inevitable involve the sacrifice of others….If, as I believe, the ends of men are many, and not all of them are in principle compatible with each other, then the possibility of conflict - and of tragedy - can never wholly be eliminated from human life, either personal or social. The necessity of choosing between absolute claims is then an inescapable characteristic of the human condition….
The extent of a man's, or a people's, liberty to choose to live as they desire must be weighed against the claims of many other values, of which equality, or justice, or happiness, or security, or public order are perhaps the most obvious examples.

Reference: Isaiah Berlin, "Two concepts of Liberty," reprinted in Four Essays on Liberty, p. 167-170.