"People who cannot respect others for their good qualities - people who only look at the bad in others - are no good themselves. By looking at only the bad points, you open yourself up, and in a real encounter, will most probably be killed."

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After I had been studying with him for two years, Schoenberg said, ‘In order to write music, you must have a feeling for harmony.’  I explained to him that I had no feeling for harmony.  He then said that I would always encounter an obstacle, that it would be as though I came to a wall through which I could not pass.  I said, ‘In that case I will devote my life to beating my head against that wall.’

— John Cage