"Even if many an illusion flees, That once your heart rejoices, the wine already gives you comfort through oblivion! Happy is he who forgets, which cannot be changed."
"Happy is he who forgets what can no longer be changed" comes from the operetta "Die Fledermaus" by Johann Strauss, whose libretto was written by Karl Haffner and Richard Genée.
.. However, centuries earlier, Emperor Frederick III had already adopted the Latin version Rerum irrecuperabilium felix oblivio as his motto.
.. and in this particular case, DT has certainly and fortunately already forgotten that the world will remember all these "little" scenes ..