The comfort of Perseverance

I've studied the doctrine of perseverance lately and have discovered a deeper understanding of God and my faith. This discovery really translates into a worshipful comfort that overcomes me when I reflect on the sovereignty of God in perseverance. Here are a few videos that give a good overview and explination of these concepts (classroom setting) from Michael Patton at bible.org. I found them to be very helpful and honest.

Video 1 - Can a believer lose their salvation?
Video 2 - A defense of conditional security.
Video 3 - A defense of eternal security.

I close with a cartoon