The Twilight of the Idols · Friedrich Wilhelm Nietzsche
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The “Kingdom of Heaven” is a state of the heart—not something which exists “beyond this earth” or comes to you “after death.” The whole idea of natural death is lacking in the gospels. Death is not a bridge, not a means of access: it is absent because it belongs to quite a different and merely apparent world the only use of which is to furnish signs, similes. The “hour of death” is not a Christian idea—the “hour,” time in general, physical life and its crises do not exist for the messenger of “glad tidings.” ... The “Kingdom of God” is not some thing that is expected; it has no yesterday nor any day after to-morrow, it is not going to come in a “thousand years”—it is an experience of a human heart; it is everywhere, it is nowhere....
Text from Project Gutenberg, public domain in the United States.