A Missionary Church
Imagine you found a cure for cancer. How urgently would you spread the news of your discovery? Who would you tell? The gospel of Jesus Christ is the cure for so many of life's ills that Mormons want to share the good news of eternal life with the same urgency.
The Lord's Church has always been a missionary church. Jesus Christ's life was the perfect example of missionary work. During His ministry on earth, he taught the gospel at all times, in all places, and to all kinds of people. Jesus taught the educated men in the temple, the sinners, the faithful and the unbelieving. He also called apostles and other disciples to preach the gospel so more people could hear about the blessings of His gospel. Most of their preaching during Christ's life was to their own people, the Jews. After Jesus was resurrected, He visited His apostles and sent them to preach to the gentiles. He commanded them, "Go ye into all the world, and preach the gospel to every creature" (Mark 16:15).
Read more at http://mormon.org/missionary-work.