In the letters of Catherine of Siena, the notion of passage goes far beyond the Santo Passaggio in the medieval sense of passagium ultramarinum. This pontifical project of an armed maritime expedition to the Holy Land, then against the Turks, first resonates with her own desire for a pilgrimage to the Holy Sepulchre, while at the same time being part of her vast programme of Universal Salvation. But when the great Western Schism broke out in 1378, the crux cismarina was imposed: a crusade to be led between Christians at the gates of Rome besieged by the troops of the schismatics, the new heretics. This evolution pushes Catherine to redefine the notion of « passage »: from its literal meaning of maritime crossing, it becomes a passage without a journey, figuratively speaking. At the same time, through her meditations, this notion was enriched by a penitential moral sense of fighting against sins and a spiritual sense of ultimate transit towards the heavenly Jerusalem, both an individual and collective destination for Christians.