Easter is the happiest day in the whole year in our Catholic faith. Christmas, too, is a joyous occasion, but whereas Christmas vibrates with a note of sweetness, Easter resounds with a note of triumph. Easter is the joy for the triumph of Christ, the joy for His victory.
St. Paul gave a homily about Easter to the early Christian community in his first epistle to the Corinthians:
Your boasting is not appropriate. Do you know that a little yeast leavens all the dough? Clear out the old yeast, so that you may become a fresh batch of dough, inasmuch as you are unleavened. For our paschal lamb, Christ, has been sacrificed. Therefore let us celebrate the feast, not with the old yeast, the yeast of malice and wickedness, but with the unleavened bread of sincerity and truth. (1 Corinthians 5: 6 – 8)