A number of years ago I floated on an inner tube down the Salt River in Arizona with a friend. We had a nice time enjoying the hot sun and cool water. We floated at a leisurely pace - taking a couple hours to reach our destination. It was a great day with my friend (and the thousands of other people around us on the river).
Before going out in the intense Arizona sun it is a good idea to put on sunblock - it is particularly a good idea for someone with skin of an alabaster hue like mine. I've never been very tan in my life (except for a couple times when I spent a lot of time outside) and have always burned easily in the sun. I had done a good job of slathering myself with sunblock - or so I thought. I missed (or, it rubbed off) about an fifteen square inch area on the front of my lower left left (starting just below the ankle and extending upwards about five inches). Over the next couple of days this area of skin turned bright red and then purple. It was blistered, swollen, and very painful; I had a difficult time walking, which was unfortunate because my summer job involved a lot of walking. After a couple weeks the color returned to normal, the blisters drained, the swelling went away, and the pain subsided. I was able to walk without pain once again. However, I still have a patch of freckles over that area - the permanent residuals of my carelessness.
There's a spiritual lesson in this. In Mosiah 4:30 we read: "But this much I can tell you, that if ye do not watch yourselves, and your thoughts, and your words, and your deeds, and observe the commandments of God, and continue in the faith of what ye have heard concerning the coming of our Lord, even unto the end of your lives, ye must perish. And now, O man, remember, and perish not." We need to watch ourselves - our thoughts, words, and deeds. We need to do this all our lives. This is not all. We also need to don the armor of God in order to protect ourselves. "Put on the whole armour of God," the apostle wrote, "that ye may be able to stand against the wiles of the devil" (Eph. 6:11).
I had covered myself in sunblock, at least I thought I was covered, but I missed a large area of my skin. I did not "put on the whole armor of God" - my "feet were [not] shod with the preparation of the gospel of peace" (Eph. 6:15), so to speak. I, like Achilles, had an unprotected spot that led to great pain and suffering (although, unlike Achilles, mine did not result in death). I was severely burned by the sun. There is another spiritual analogy with this and making sure we are in a position where we are not burned at the Second Coming (or in the next life) but I'll not expand on that.
Are you protected against all the wiles of the adversary? Have you completely protected yourself with a spiritual sunblock? Do you reapply it frequently? Have you donned the armor of God? If so, do you wear all your armor all the time? We need to protect ourselves - physically and spiritually.