Pharaoh's Salvation

We are always trying to make sure that the future is as secure as possible. Is this car I’m buying worth the money? How can I know I’m marrying the right person? What is the weather going to be like next week? Yet, the future remains a mystery to us. What of more important things – what of salvation? Indeed, we are given many assurances, but many of us still have doubts. What if we don’t believe rightly, or enough? What can Pharoah’s failure teach us about our own salvation? To change the question slightly, what can we do to assure our destruction?