The true Christians are those who understand that on earth they will always be aliens. Our native land is above in God’s heaven where there are no strangers. If we are all moving on, we should now perform good works which cannot be lost so that we can find in heaven our good works waiting for us. For example, in this life we should recognize our duty of hospitality, a work that will bring us to God. In this life we should receive strangers kindly because we are aliens just like them. Why are you afraid of losing what you invest here by generosity? Christ the Lord is keeper of such good works.

–Augustine, Sermon 111.4