Apparently us Catholics are in some pretty desperate need of this affirmation, considering that according to recent polling 15% of us are unaware of this fact!
"Now if Christ be preached, that he arose again from the dead, how do some among you say, that there is no resurrection of the dead? But if there be no resurrection of the dead, then Christ is not risen again. And if Christ be not risen again then is our preaching vain, and your faith is also vain. Yea, and we are found false witnesses of God: because we have given testimony against God, that he hath raised up Christ; whom he hath not raised up, if the dead rise not again. For if the dead rise not again, neither is Christ risen again. And if Christ be not risen again your faith is vain, for you are yet in your sins. Then they also that are fallen asleep in Christ, are perished. If in this life only we have hope in Christ, we are of all men most miserable. But now Christ is risen from the dead, the firstfruits of them that sleep. For by a man came death, and by a man the resurrection of the dead. And as in Adam all die, so also in Christ all shall be made alive." 1 Corinthians 15:12-22.
"The Holy Father affirmed that the Resurrection 'is not a theory, but a historical reality': 'It is neither a myth nor a dream, it is not a vision or a utopia, it is not a fairy tale, but it is a singular and unrepeatable event: Jesus of Nazareth, son of Mary, who at dusk on Friday was taken down from the Cross and buried, has victoriously left the tomb.'"