Be sober,be vigilant; because your adversary the devil,as a roaring lion, walketh about, seeking whom he may devour. (1 Peter 5:8)

If you have ever been camping, and I'm sure we all have been on at least one camping trip during our lives. What is one of the first things you do when you get to the campsite? Build a fire, right? Do you know why we build fires at campsites? Not only to keep warm during the night, or cook food; but we build fires to keep away the pests, and other wildlife. Such as a bear, lion, raccoon, and others. Throughout the night you wake up every few hours to make sure the fire is still burning and stoke it some more. As long as that fire burns the wildlife stays away or at least stays in the shadows. But, the minute that fire goes out and you leave it alone here they come to invade your camp.
Well, Christians are the same way. We have a fire burning inside of us, "the fire of God," there are things we do to keep it up too. But, why do we keep up our fire? As long as we keep feeding our fire and stoking our fire, the enemy, Satan stays away, mostly. He lurks in the shadows, when we let our fire die down just a little bit and the shadows begin to get closer to our fire, then the enemy begins to get closer. When we let our fire burn completely out then, Satan invades our camp and makes it one HUGE mess, and attacks us.
As Christians we need to keep our fire inside of us nice and strong stoking it everyday, read the Bible, 5 min. of prayer time, whatever it takes to keep your fire going, you need to make time during the day to do that. The more we feed our fire and stoke our fire the harder it is for it to die down or be extinguished. But, the more we allow ourselves to slip and become unfaithful to these things the easier it is for an attack to happen and the easier it is to get knocked down. Sometimes, it also makes it extremely hard to get back up and keep fighting. Be on the safe side, don't let your fire die down even the slightest little bit, if it does anything, it should be getting stronger and harder to extinguish.