The Three Great Essentials To Achieve

This saying is attributed to Edison from remarks to a reporter, and while no specific dated source has been confirmed, variations appear in multiple interviews from the 1910s and 1920s. Edison's emphasis on the three qualities — hard work, perseverance, and practical common sense — reflected his dismissal of purely theoretical approaches to invention. He frequently contrasted his industrial laboratory method with academic science, arguing that practical application required these three qualities above all.