Felix culpa

Felix culpa is a Latin phrase that comes from the words felix (meaning "happy," "lucky," or "blessed") and culpa (meaning "fault" or "fall"), and in the Catholic tradition is most often translated "happy fault," as in the Paschal Vigil Mass Exsultet O felix culpa quae talem et tantum meruit habere redemptorem, "O happy fault that earned for us so great, so glorious a Redeemer."