Heaven on Earth

John Piper writes in Let The Nations Be Glad: The Supremacy of God in Missions:

How many Christians set their sights on a "Sabbath evening" of life - resting, playing, travelling, etc. - the world's substitute for heaven since they do not believe there will be one beyond the grave. The mindset is that we must reward outselves in this life for the long years of labor. Eternal rest and joy after death is an irrelevant consideration. What a strange reward for a Christian to set his sights on! Twenty years of leisure while living in the midst of the last days of infinite consequence for millions of unreached people. What a tragic way to finish the last lap before entering the presence of the king who finished his so differently!

Available used on Amazon from $4; I definitely recommend this (so far - I'm halfway done) for anyone who wants simply-worded theology on being used by God during their life on earth.