And when you hear that we look for a kingdom, you suppose, without making any inquiry, that we speak of a human kingdom. Instead, we speak of that which is with God, as can be shown from the confession of their faith made by those who are charged with being Christians, even though they know that death is the punishment awarded to those who so confess. For if we looked for a human kingdom, we would deny our Christ, so that we might not be killed. We would try to escape detection, so that we might obtain what we hope for. But since our thoughts are not fixed on the present, we are not concerned when men cut us off; since death is a debt which must at all events be paid.
Justine Martyr (First Apology 11)