diff --git a/README.org b/README.org
index 67ee75c..dea18b8 100644
--- a/README.org
+++ b/README.org
@@ -400,6 +400,17 @@ structurally insufficient to be the /foundation/ of our approach.
 
 *** Blocklists, allow-lists, and perimeter security
 
+#+BEGIN_QUOTE
+  "With tools like access control lists and firewalls, we engage in
+  'perimeter defense', which is more correctly described as 'eggshell
+  defense'. It is like an eggshell for the following reason: while an
+  eggshell may seem pretty tough when you tap on it, if you can get a
+  single pinhole anywhere in the surface, you can suck out the entire
+  yoke. No wonder cybercrackers laugh at our silly efforts to defend
+  ourselves. We have thrown away most of our chances to defend
+  ourselves before the battle even begins."
+    -- Marc Stiegler, [[http://www.skyhunter.com/marcs/ewalnut.html][E in a Walnut]]
+#+END_QUOTE
 
 
 *** Access Control Lists