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.

(Saint Gregory the Great, Forty Gospel Homilies, 5.2)