“Sometimes I use the phrase ‘wartime lifestyle’ or ‘wartime mind-set.’ The phrase is helpful–but also lopsided. For me it is mainly helpful. It tells me that there is a war going on in the world between Christ and Satan, truth and falsehood, belief and unbelief. It tells me that there are weapons to be funded and used, but these weapons are not swords or guns or bombs but the Gospel and prayer and self-sacrificing love (2 Corinthians 10:3-5). And it tells me that the stakes of this conflict are higher than any other war in history; they are eternal and infinite: heaven or hell, eternal joy or eternal torment (Matthew 25:46).
“I need to hear this message again and again, because I drift into a peacetime mind-set as certainly as rain falls down and flames go up. I am wired by nature to love the same toys that the world loves. I start to fit in. I start to love what others love. I start to call earth ‘home.’ Before you know it, I am calling luxuries ‘needs’ and using my money just the way unbelievers do. I begin to forget the war. I don’t think much about people perishing. Missions and unreached peoples drop out of my mind. I stop dreaming about the triumphs of grace. I sink into a secular mindset that looks first to what man can do, not what God can do. It is a terrible sickness. And I thank God for those who have forced me again and again toward a wartime mind-set.”
John Piper, “Don’t Waste Your Life,” p. 112.