After the somber and penitential Mass of Ash Wednesday, the Sistine Chapel Choir erupted into Palestrina's Tu Es Petrus (Thou Art Peter). The faithful expressed their sorrow in great leaps of joy. The altar boys and concelebrants can barely contain themselves. Starting at 2:36 you can see Archbishop Georg Ganswein, the Pope's former secretary and current administrator of the Papal household, holding back his tears.
"Et ego dico tibi quia tu es Petrus et super hanc petram aedificabo ecclesiam meam et portae inferi non praevalebunt adversum eam. Et tibi dabo claves regni caelorum et quodcumque ligaveris super terram erit ligatum in caelis et quodcumque solveris super terram erit solutum in caelis"
"And I say to thee: That thou art Peter; and upon this rock I will build my church, and the gates of hell shall not prevail against it. And I will give to thee the keys of the kingdom of heaven. And whatsoever thou shalt bind upon earth, it shall be bound also in heaven: and whatsoever thou shalt loose upon earth, it shall be loosed also in heaven." —Matthew 16:18-19