What is passion?

“It is surely the becoming of a person. Are we not, for most of our lives, marking time? Most of our being is at rest, unlived. In passion, the body and the spirit seek expression outside of self. Passion is all that is other from self. The more extreme and the more expressed that passion is, the more unbearable does life seems without it. It reminds us that if passion dies or is denied, we are partly dead and that soon, come what may, we will be wholly so.”  ~John Boorman