Robert Grosseteste

You can hold yourself back from the sufferings of the world, that is something you are free to do and it accords with your nature, but perhaps this very holding back is the one suffering you could avoid.

Music would lose its charm were not dissonance interspersed at frequent intervals. The closer a composer can come to discord without actually entering it in the score, the more pleasing will be his composition when given life through musical instruments.