This Last Great Day has meaning that is incomprehensible to the world. They don’t keep the Feast days and so they simply cannot understand. Because we keep this day we understand that those who were not called in previous ages, who have never heard the name of Jesus Christ or the message He brought, will, in just over a thousand years from now, have their first and only opportunity for salvation. Because people have to accept Jesus Christ as their personal Saviour, this automatically rules out all those other religions and ideas that have their basis on other erroneous foundations.