There are two great fundamental problems common to all thought: (i) the problem of world- and life-affirmation and world- and life-negation, and (2) the problem of ethics and the relations between ethics and these two forms of man's spiritual attitude to Being.

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Quote text and notes from Wikiquote: Albert Schweitzer (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.