No prudent antagonist thinks light of his adversaries.

Master and Doctor are my titles; for ten years now, without repose, I held my erudite recitals and led my pupils by the nose.

Many hammer all over the wall and believe that with each blow they hit the nail on the head.

Ye great teachers: listen to what you say!

The greatest piece of folly is that every man thinks himself compelled to hand down what people think they have known.

Whoever makes it a rule to test action by thought, thought by action, cannot falter, and if he does, will soon find his way back to the right road.

A phenomenon like Mozart remains an inexplicable thing.