The man that hath no music in himself
"The man that hath no music in himself,
Nor is not mov'd with concord of sweet sounds,
Is fit for treasons, stratagems, and spoils."
Jessica, daughter of Shylock, has eloped with Lorenzo, and they
are sitting in the moonlight delighting in each other's company.
When musicians enter, Jessica remarks that she is never happy when
she hears sweet music and that instead it makes her sad. Lorenzo
explains to her that the sadness she feels is the hearkening of her
soul to celestial powers. It was a basic assumption among
Elizabethans that the musical harmony of the spheres (planets,
moon, sun) was a manifestation of the universal Order in which God
created heaven and earth. Lorenzo reminds Jessica that music
affects even wild beasts, and that nothing in nature is immune to
its ability to determine human emotion. "Mark the music."