Nothing is more terrible than to see ignorance in action.

If a man writes a book, let him set down only what he knows. I have guesses enough of my own.

People do not mind their faults being spread out before them, but they become impatient if called on to give them up.

He who is wise puts aside all claims which may dissipate his attention, and confining himself to one branch excels in that.

You'll never attain it unless you know the feeling.

Everyone only hears what he understands.

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