Ken Thompson's acceptance speech for the Turing Award on security thinking.

"The moral is obvious. You can't trust code that you did not totally create yourself."

- 𝗖𝗼𝗺𝗽𝘂𝘁𝗲𝗿 𝗦𝗲𝗰𝘂𝗿𝗶𝘁𝘆 𝗶𝗻 𝘁𝗵𝗲 𝗥𝗲𝗮𝗹 𝗪𝗼𝗿𝗹𝗱 by Butler Lampson (2004)
https://www.microsoft.com/en-us/research/wp-content/uploads/2004/06/Computer-Security-in-the-Real-World.pdf