If you want to understand the madness and the magic behind The Metamorphosis , you have to read Letters to Felice .

"I don't want any answers to my letters, I want to hear about you, only about you." — Franz Kafka, Letters to Felice (April 10, 1913)

It is a beautiful, intimate look into a tortured soul attempting to connect. If you want to understand the man behind the myths, start here.

"You are at once both the quiet and the confusion of my heart." — 1912.

"I miss you deeply, unfathomably, senselessly, terribly." [0.5.34 - Note: This is frequently associated with both Milena and Felice due to the similar nature of the longing ].