The kingdom of heaven has no price tag on it: It is worth as much as you have. For Zacchaeus it was worth half of what he owned, because the other half that he had unjustly pocketed he promised to restore fourfold. For Peter and Andrew it was worth the nets and vessel they had left behind; for the widow it was worth two copper coins; for another it was worth a cup of cold water. So, as we said, the kingdom of heaven is worth as much as you have.

—Gregory the Great, Forty Gospel Homilies 5.2