Jean Rostand, Thoughts of a biologist (1939) quotes
"To be an adult is to be alone."
"Kill one man, and you are a murderer. Kill millions of men, and you are a conqueror. Kill them all, and you are a god."
Do to others what you would have them do to you.
The source of the famous Golden Rule. Many famous lines were variations on this theme.
"To be an adult is to be alone."
"Kill one man, and you are a murderer. Kill millions of men, and you are a conqueror. Kill them all, and you are a god."