The Gospel of Mark ends rather abruptly. The women leave the tomb trembling and astonished, and they were afraid.
There's a lot to learn from these few verses. First is the truthfulness behind this eyewitness account. The fact that women were the first ones at the tomb and that the disciples look foolish for not remembering the words of Jesus make the story credible. If it were made up, they would make themselves look good, not silly.
In addition, these verses demand we give our lives and devotion to the risen Lord. They encountered the living God, and through these verses we do as well.
In the end, Jesus doesn't want us to settle for a little Christianity on Sunday mornings. Rather, take all you have and buy all the gospel you can get your hands on.