We ratify the law, but we condemn your interpretation, for He of whom ye say that He will come—our Lord Jesus Christ—has come, as the Church teaches … - Callixtus III

Nothing will induce me to leave Rome, not even if, like so many others, I am to fall a victim to the plague. Mahomet, the enemy of our faith, compels me to remain. He does not relax his efforts, although thousands in his immense army have been carried off.

Beloved son! continue to defend the Catholic Faith; God, for whom you fight, will not abandon His cause. He will, I am confident, grant success against the Turks and the other unbelievers to you and the rest of the Christians with great glory and honour.

I, Pope Calixtus, vow to Almighty God and the Holy Trinity that by war, maledictions, interdicts, excommunications, and all other means in my power, I will pursue the Turks, the most cruel foes of the Christian name.