Title: He was not seen by all the people
God has nothing to prove to the skeptics, and even in our own times the light of the person of the Lord Jesus can only be construed by those who would share in his way of life and in the many sacrifices and perils of the gospel and the testimony that only through the Lord Jesus can there be forgiveness of sins and, as a result, eternal life.
The historicity and majesty of the resurrection is not for those who could see only with their eyes, but for those who would have their souls enlightened because they have benefited from its power over death and condemnation.