This quote was attributed to Albert Schweitzer by Rachel Carson on p. 17 of her seminal work Silent Spring (1962), and is widely cited on various Internet websites, but an actual source from Schweitzer’s works is elusive.
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Attribution
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.