Chazal tell us that Hashem created a malach whose sole job it is to trip up man -- to get us to sin, to get us to fail, to get us to mess up.

Where is he?
What voice does he speak with?
How can I identify him?

For most of us, without direct guidance from chazal it is difficult to quantify and identify the soton. Does he speak in my head? Whose voice does he use? How can I tell?

This Shmuz brings us face to face with a powerful force that is foreign to western thought, and requires great understanding to recognize.