1 The first virtue, yea the whole of virtue, is to be a stranger to this world, and a sojourner, and to have nothing in common with things here, but to hang loose from them, as from things strange to us; As those blessed disciples did, of whom he says, “They wandered about in sheepskins, and in goat-skins, being destitute, afflicted, tormented: of whom the world was not worthy.”
They called themselves therefore “strangers”; but Paul said somewhat much beyond this: for not merely did he call himself a stranger, but said that he was dead to the world, and that the world was dead to him. “For the world” (he says) “has been crucified to me and I to the world.” But we, both citizens and quite alive, busy ourselves about everything here as citizens. And what righteous men were to the world, “strangers” and “dead,” that we are to Heaven. And what they were to Heaven, alive and acting as citizens, that we are to the world. Wherefore we are dead, because we have refused that which is truly life, and have chosen this which is but for a time. Wherefore we have provoked God to wrath, because when the enjoyments of Heaven have been set before us, we are not willing to be separated from things on earth, but, like worms, we turn about from the earth to the earth, and again from this to that; and in short are not willing to look up even for a little while, nor to withdraw ourselves from human affairs, but as if drowned in torpor and sleep and drunkenness, we are stupefied with imaginations.
Source: Homilies on the Epistle to the Hebrews (New Advent)