| Biography, History
The character Prof. Lüders is based on Otto Köhler, professor from the University in Cologne who is known for being one of the biggest critics of Diesel's work and he supported the Deutz factory Essen in one of the patent cases against Diesel.
Sometimes you have to trust God, my dear woman.
Mutter Diesel: I don't know if God would take care of the school money too.
At one moment the doctor quotes the line "What you own you don't need and what you need you don't own", to what Dieses says that it was said by Goethe. However this quote is originally latin from the Roman lawbooks at the time of Cicero.