In today's first reading at Mass from Philippians 3, Paul spoke of all followers of Christ as having their citizenship in heaven. We become citizens of a country because we love the country and the country welcomes and accepts us. As citizens of heaven, we love God and God welcomes and accepts us. To link ourselves to God, to heaven, is the most important single thing we need to do in this life. It may sound selfish, but it's exactly what God wishes.