The veil of ignorance.

Philosophers
John Rawls
American political philosopher (1921-2002) whose 1971 A Theory of Justice revived Anglophone political philosophy. His "veil of ignorance" and two principles of justice gave welfare-state liberalism its foundation.
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Source: ロールズ『正義論』§24 (1971年)Verified
John Rawls's Other Quotes
Each person possesses an inviolability founded on justice that even the welfare of society as a whole cannot override.
Social and economic inequalities are to be arranged so that they are to the greatest benefit of the least advantaged members of society.
Justice is the first virtue of social institutions, as truth is of systems of thought.