Indwelling Sin

I was reading Park Community Church's 8 Minutes With God devotional this morning, and I came across this quote from theologian John Owen regarding the reality of sin in our lives:

"When we realize a constant enemy of the soul abides within us, what diligence and watchfulness we should have! How woeful is the sloth and negligence then of so many who live blind and asleep to this reality of sin. There is an exceeding efficacy and power in the indwelling sin of believers, for it constantly inclines itself towards evil. We need to be awake, then, if our hearts would know the ways of God.

Our enemy is not only upon us, as it was with Samson, but it is also in us. So if we would not dishonor God and His gospel, if we would not scandalize the saints of God, if we would not avoid our own conscience and endanger our own soul, if we would not grieve the Holy Spirit, then we must stay alert to our own danger."