“Peace of mind is the most important prerequisite for creative work.”
Richard Feynman (verified, secondary source)
• Title: A Short Talk about Richard Feynman
• Author: Stephen Wolfram
• Type: Article
• Publisher: Stephen Wolfram: Official Website
• Publication time: 2005
• Publication place: United States
• Link: https://www.stephenwolfram.com/publications/short-talk-about-richard-feynman/