Comment by simondotau

The better version of this principle is John Rawls' "Veil of Ignorance".

In this "original position", their position behind the "veil of ignorance" prevents everyone from knowing their ethnicity, social status, gender, and (crucially in Rawls's formulation) their or anyone else's ideas of how to lead a good life.

https://en.wikipedia.org/wiki/Original_position