Do not suppose that by heaven here is meant the upper regions of the sky of this visible world, for your reward is not to be placed in things that are seen, but by "in heaven" understand the spiritual firmament, where everlasting righteousness dwells.

-St. Augustine, commentary on Christ's words, "Rejoice and be exceedingly glad, for great is your reward in heaven..."

Augustine, in this commentary, instructs his audience to let go of any corporal, materialistic conceptions of heaven, and instead seize the spiritual understanding of heaven that only the inner eye can observe.