Jesus his disciples he told him that they shall be his witness. Their duty was to testify that he rose from the dead. One thing that makes us unique from other religions is that our founder is still alive. And we know that you cannot give what you do not have. But our lord is alive and because he lives, we also live. He said he came that we might have life and have it in abundance. From 1 Corinthians 15 we learn that our hope of ressurections is in the fact he rose from the dead and he did not rise then we are the most sad people on earth but our savior lives. And because he lives, we live as well