When David Thoreau, the American writer, was on his deathbed, he was visited by a minister who urged his dying friend to be ready for death. The pastor queried, “Do you know where you are going in the next life?” Thoreau waved him away with the words, “One world at a time.”
One world at a time is the trademark of the man who lives his life apart from God. It is an under the sun perspective on life that focuses on self, time, and the body over, and against God, eternity, and the soul. Such was the case with the rich fool in Jesus’ parable in Luke twelve (Luke 12:13-21). What we are talking about is a godless existence that is all soil and no sky. Sadly, David Thoreau was speaking for many in this world when he left this world. In fact, according to Jesus, men will live one world at a time until the end of time (Matthew 24:36-42). This is how the world rolls.
The Christian by contrast lives two worlds at a time. The believer in Jesus Christ has an out of this world perspective on life. According to the apostle Paul, the Christian is also a citizen of heaven while living on earth (Phil. 3:20-21). When Paul wrote this to the Philippians, he was making a profound statement. Philippi was a colony of Rome which meant that although they were hundreds of miles from Rome, their laws and lifestyle mirrored that of the great city of Rome. When in Philippi, you do what the Romans do. Just as the Roman colonists at Philippi were not allowed to forget that they owed their allegiance to Rome, so Paul urged the saints at Philippi not to forget that this world was not their home, but that they belonged to a better country (Heb. 11:16).
The take away for those of us who have been born from above is that life on earth must constantly be intersected by thoughts of heaven. While our feet are on the ground our heads must be in the clouds (Col. 3:1-3). Our focus and identification must be with the laws and lifestyle of heaven. Heaven must be to us a transforming point of reference not simply a divine Disneyland in the sky. In heaven they are holy, so must we be. In heaven they are obedient, so must we be. In heaven they are active serving the Lord, so must we be. In heaven they are happy, so must we be. In heaven they are at peace, so must we be. In heaven they are united, so must we be. A man was asked if he expected to go to heaven when he died, “Why of course,” he replied, “I live there now.” To be heavenly minded doesn’t mean that you are dreamy, impractical or distant. It means that your present is governed by your future. Be an out of this world Christian!
 Gary Inrig, The Parables, (Grand Rapids: Discovery House, 1991) 124.