Human beings suffer their own memory and imagination; that is they suffer that which does not exist.

You can use this mind either to create wellbeing or misery for yourself. Everyone has this choice.

The mind is not in one particular place. Every cell in the body has its own intelligence.

If your thought process happened the way you want, why would you ever be miserable.  

Fear, anger, misery, frustration, depression, and despair are all products of a mind that you have not taken charge of.