diff --git a/PRINCIPLES.md b/PRINCIPLES.md
index bec81a7..d405bc1 100644
--- a/PRINCIPLES.md
+++ b/PRINCIPLES.md
@@ -63,6 +63,7 @@
 * Keep your code absolutely simple. Keep looking at your functions and figure out how you simplify further - [John Romero](https://twitter.com/CodeWisdom/status/926568192729894912)
 * Fix it immediately, but plan for the future fix. Document the fix. Automate the solution. [Adam Bertram](https://www.pluralsight.com/blog/it-ops/troubleshooting-tips)
 * Finding errors in your past decisions and ideas means you’re progressing. - [Greg Kogan](https://www.gkogan.co/blog/progression/)
+* You can’t go fast when everyone is spending their time fighting with the poor decisions of yesterday - [Adam Chester](https://twitter.com/adamchester/status/925479016798109696)
 
 ## personal thoughts
 * [MorganGeek](https://twitter.com/MorganGeek/statuses/420907517934178304) - Problem solving / Productivity : Good programmers write code after they found the solution. Un bon programmeur ne commence à coder qu'après avoir trouvé une solution.