A holy door or porta sancta has been used since the fifteenth century as a ritual expression of conversion. Pilgrims and penitents pass through it as a gesture of leaving the past behind and crossing the threshold from sin to grace, from slavery to freedom, and from darkness to light. Often these rituals are associated with prayer, pilgrimage, sacrifice, confession, and indulgences.

But the door finds meaning only when the believer associates the door with Christ. Jesus is the Door! In the words of Pope Francis, “There is only one way that opens wide the entrance into the life of communion with God: this is Jesus, the one and absolute way to salvation. To him alone can the words of the Psalmist be applied in full truth: ‘This is the door of the Lord where the just may enter’ (Ps 118:20).”

Saint John Paul II offers a similar exhortation: "To focus on the door is to recall the responsibility of every believer to cross its threshold. To pass through that door means to confess that Jesus Christ is Lord; it is to strengthen faith in him in order to live the new life which he has given us. It is a decision which presumes freedom to choose and also the courage to leave something behind, in the knowledge that what is gained is divine life [cf. Mt 13:44-46]” (Saint John Paul II, Incarnationis Mysterium, 8, in the year 2000).