To every man is given the key to the gates of heaven. The same key opens the gates of hell. -Richard Feynman https://www.goodreads.com/quotes/421467-to-every-

To every man is given the key to the gates of heaven. The same key opens the gates of hell. -Richard Feynman https://www.goodreads.com/quotes/421467-to-every-man-is-given-the-key-to-the-gates https://www.goodreads.com/quotes/421467-to-every-man-is-give... https://calteches.library.caltech.edu/1575/1/Science.pdf https://calteches.library.caltech.edu/1575/1/Science.pdf