There are many men now living who were in the habit of using the age-old expression: 'It is as impossible as flying.' The discoveries in physical science, the triumphs in invention, attest the value of the process of trial and error. In large measure, these advances have been due to experimentation.

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