Hekiganroku - Kyosei and the Raindrops

Hekiganroku - Case 46: 

Kyosei asked a monk,
  "What is that sound outside?"
The monk said,
  "That is the sound of raindrops." 
Kyosei said, 
  "People live in a topsy-turvy world. They lose themselves in delusion about
   themselves and only pursue [outside] objects."
The monk said,
  "What about you, Master?"
Kyosei said,
  "I was on the brink of losing myself in such delusions about myself."
The monk said,
  "What do you mean, 'on the brink of losing myself in such delusions
   about myself'?"
Kyosei said,
  "To break through [into the world of Essence] may be easy. But to express
   fully the bare substance is difficult."

Read more : Hekiganroku ( blue cliff record, Pi-yen-lu)