diff --git a/writing/post-self/selected-letters/018.md b/writing/post-self/selected-letters/018.md
index dd06bf50..97634dbc 100644
--- a/writing/post-self/selected-letters/018.md
+++ b/writing/post-self/selected-letters/018.md
@@ -62,3 +62,5 @@ It's getting on bed time and May's whining at me pitifully, so I'm going to go a
 We all send our love to you and yours, and hope the universe is treating you well.
 
 Ioan Bălan
+
+[^emerson]: This one took some digging. It's from his essay "The Poet": "Here is the difference betwixt the poet and the mystic, that the last nails a symbol to one sense, which was a true sense for a moment, but soon becomes old and false. For all symbols are fluxional [...] Mysticism consists in the mistake of an accidental and individual symbol for a universal one." Where do they even find this stuff?