"'The vision of the evenings and mornings that has been given you is true, but seal up the vision, for it concerns the distant future.'" NIV translation
The messenger tells Daniel (and us as well) that the prophecy not only concerned the near future of Antiochus but also the distant future of the Anti-Christ. We must remember that what was distant to Daniel is very close today.
"I, Daniel, was exhausted and lay ill for several days. Then I got up and went about the king's business. I was appalled by the vision; it was beyond understanding." NIV translation
Daniel was so shaken by this vision that he became sick. After his recovery, he went on with his life of service to the king. That is a good lesson for us as Christians because many people get so caught up in prophecy that they don't pay any attention to what is happening now.