Spiritual Suicide

I came across these words in a journal entry I made: Spiritual Suicide. I'm not sure what the entry was about and I doubt that there was a real connection to the words and the entry. Those words still resonate with me though. What is a spiritual suicide? How can you commit spiritual suicide? Growing up in a religious household nurturing the spirit was important. I have to admit that I couldn't imagine not believing in the spirit within us. There is definitely this energy that runs through are body that is it's own entity.

spirit-(as defined by dictionary.com)

–noun
1.
the principle of conscious life; the vital principle in humans, animating the body or mediating between body and soul.
2.
the incorporeal part of humans: present in spirit though absent in body.
3.
the soul regarded as separating from the body at death.
4.
conscious, incorporeal being, as opposed to matter: the world of spirit.
5.
a supernatural, incorporeal being, esp. one inhabiting a place, object, etc., or having a particular character: evil spirits.


There are 25 definitions as to what a spirit is but the first five cover the basic sense in which I'm using it.

So how could you commit spiritual suicide if a spirit is of an alternate world?