The Highlights of Jesus Christ's resurrection appearance as outlined in / Corinthians are:
(i) St. Paul reminded the Corinthians of the content of the Gospel of salvation, which he had already preached to them. This included the fact that Jesus died for the sins of the world, he was buried and was raised on the third day in accordance with the scriptures. He appeared to Cephas and the twelve and later to more than five hundred brethren at one time, some of which were still alive while some had fallen asleep. Then, he appeared to James and all the apostles. Last of all, as to one untimely born, he appeared also to Paul who being the least of the apostles was unfit to be called an apostle because he had persecuted the church of God.
(ii) The grace of God towards Paul made him what he was for Christ and such grace was not in vain. It made Paul to work harder than any of those who received Christ before him.
(iii) If there was no resurrection, it meant that Christ had not been raised and the apostolic preaching and the Christian faith should have been in vain for the apostles must have been misrepresenting God who they preached had raised Christ from the dead.
(iv) If Christ had not been raised, then their faith was futile. They remained in sin and the dead in Christ had perished.
(v) If it was for this life that Christians hoped in Christ, then they should have been the most pitied of all men.