Without absolute certainty, ...

Without absolute certainty, what do we do? We do the best we can. Injustice is happening now; suffering is happening now. We have choices to make now. To insist on absolute certainty before starting to apply ethics to life decisions is a way of choosing to be amoral.
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 Richard Stallman

Quotes from the same author

Every decision a person makes stems from the person's values and goals. People can have many different goals and values; fame, profit, love, survival, fun, and freedom, are just some of the goals that a good person might have. When the goal is to help others as well as oneself, we call that idealism. My work on free software is motivated by an idealistic goal: spreading freedom and cooperation. I want to encourage free software to spread, replacing proprietary software that forbids cooperation, and thus make our society better.
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 Richard Stallman
Once GNU is written, everyone will be able to obtain good system software free, just like air.
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 Richard Stallman
To be able to choose between proprietary software packages is to be able to choose your master. Freedom means not having a master.
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 Richard Stallman
Whether gods exist or not, there is no way to get absolute certainty about ethics. Without absolute certainty, what do we do? We do the best we can.
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 Richard Stallman
All governments should be pressured to correct their abuses of human rights.
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 Richard Stallman