We Are What We Allow.

Remember, it is sin to know what you ought to do and then not do it.

James 4:17

When I first read this verse, I thought it only applied to my actions.  As I grew and my curiosity became more intense, I realized that this verse has a plethora of meanings.
For example, if I know that I should not let someone take advantage of me, yet I choose the path of least resistance and tell myself (and others) "I just couldn't stop myself" then I have committed sin.

Likewise, if I see someone getting mugged and my thought is "Glad that's not me" then I have committed sin.

If I know someone will tempt me to do the wrong thing, and I still hang around with them, I AM WRONG!  It is better to lose a "friend" than have to deal with the consequences of being led astray.

You see, when we become lazy and chose NOT to think and NOT to act then we are WRONG!  Remember that God has given each of us a brain, and it's for more than just keeping our ear from slapping together.