Deuteronomy 23:9 When you are camped against your enemies keep away from everything impure.
When I read this passage of scripture, I realized that in order to fight for God's Kingdom in the world around us, we need to insure we have already won in our own lives. As Christians, we cannot fight something we are a part of. We cannot fight against the Kingdom of Darkness in the world around us if we haven't rooted it out of our own lives.
This observation led me to recognize the need to regularly search my life for sin. If I am turning a blind eye towards sin in an area of my own life, how will I be able to recognize sin in the world around me? As a result, I have decided to dedicate a portion of my prayer time to ask God to reveal areas of my life in which I need to separate myself from sin.