The topic sentence is a translation of a line from the oath sworn by new soldiers in the Swiss Guard, a small force responsible for the safety of the Pope and the security of the Apostolic Palace, serving as the de facto military of Vatican City. Here's the full oath from the 2008 ceremony:
"I vow to faithfully, honestly and honourably serve the reigning Pope Benedict XVI and his legitimate successors, and to dedicate myself to them with all my strength, ready to sacrifice, should it become necessary, even my own life for them. I likewise assume this promise toward the members of the Sacred College of Cardinals during the period of the Sede Vacante of the Apostolic See. Furthermore, I pledge to the Commandant and to my other superiors respect, fidelity, and obedience. I swear to abide by all the requirements attendant to the dignity of my rank."