The gospels attest to Christ’s resurrection from the dead. The gospels narrate about the many trustworthy witnesses. Even St. Paul in his 1st letter to the Corinthians chapter 15 verses 3 to 8 talks about more than 500 witnesses who had seen Christ risen from the dead.
What is important to us is the reality and assurance from Jesus Christ that He will provide clear signs and proofs of power to accompany the true believers. This is a fact and is well documented in the annals or records of the Catholic Church history. In the last part of the gospel according to St. Mark chapter 16:16-20, you can read these assuring words: “Go out to the whole world; proclaim the Good News to all creation. He who believes and is baptized will be saved; he who does not believe will be condemned. These are the signs that will be associated with believers: in my name they will cast out devils; they will have the gift of tongues; they will pick up snakes in their hands, and be unharmed should they drink deadly poison; they will lay their hands on the sick, who will recover.”
It is also a fact in the roster of Catholic Saints which go by the thousands, and you can check this for yourself—before the authorities in the Vatican declared the Saints of the whole Church and the world the people concerned (friends, companions or relatives) had to ask from God first class miracles (two or three) and well documented by impartial witnesses before the final Church approval of the Saint in question. This is how the Church has operated ever since in connection with the beatification or canonization of Saints. Contra factum non valet (no better arguments than facts). Clear facts and reality (miracle) are the proof of God’s approval, not just words or rumors from people.