Our eternal destiny is heaven. Paul wants people to live each day with that understanding. Things in this life that have no impact on eternity carry much less importance with this view in mind. Christians do not currently live in heaven, but our destiny is guaranteed, so our citizenship is already there. Christians are representatives of Christ and are given the job of bringing others to Christ.
Our life here on earth is a journey that ends in heaven. Planning the trip is important, but the destination is far more important. Many live their lives as if the journey is the only thing that matters. That’s like spending all your time planning the route you are going to drive to get your new home without making arrangements for where you are going to live or how you are going to support yourself once you are there. Are you planning your journey and ignoring your destination? Are you concerned about other people’s destinations?