Above all things, I must not ...

Above all things, I must not get angry. If I do get angry I knock all the teeth out of the mouth of the poor wretch who has angered me.
 Franz Schubert

Quotes from the same author

One bites into the brass mouthpiece of his wooden cudgel, and the other blows his cheeks out on a French horn. Do you call that Art?
 Franz Schubert
There are two contrary impulses which govern this man's brain-the one sane, and the other eccentric. They alternate at regular intervals.
 Franz Schubert