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 ).
Why Mormons Send Missionaries Around the World
We believe we are all part of one heavenly family, so missionary work isn't work so much as it is trying to help out our brothers and sisters.
That Mormons do missionary work is one of the Church's most recognized characteristics. Right now, tens of thousands of missionaries are walking, driving or riding their bikes around the world, handing out copies of the Book of Mormon and sharing the gospel with the people they meet. Why do these people, most of them under the age of 25, volunteer to leave their homes at their own expense and dedicate a period of their lives to preaching the gospel of Jesus Christ?
The Lord said, "proclaim my gospel from land to land, and from city to city… bear testimony in every place, unto every people" ( Doctrine and Covenants 66:5,7 ). We take that commandment to heart and look for opportunities to share the blessings we've received from living the gospel with everyone we can. Jesus taught, "Except a man be born of water and of the Spirit, he cannot enter into the kingdom of God" ( John 3:5 ). Knowing that certain ordinances like baptism are necessary for us to return to live with our Heavenly Father, we feel an urgent need to share this blessing with everyone we can. Our first interest as a Church—is that as many of the children of men as can, will be saved and exalted. While we work out our own salvation, we want to help those around us do the same. Because we are all sons and daughters of our Heavenly Father, the more of us that are able to learn and keep His commandments and enjoy eternal life, the happier we'll all be.
A common morning for a missionary might consist of waking up at 6:30 a.m., studying the scriptures, and meeting new people to share the gospel with. The afternoon might include discussing gospel lessons with people they meet and volunteering for service in the community. A good night has them teaching the gospel to interested individuals and helping them learn and keep God's commandments or attending a baptismal service for someone who's decided to join the Church. They return home around 9:30 p.m. and fall into bed, usually exhausted and happy.
We Teach of Jesus Christ
Mormons are known for the things they don't drink, their emphasis on the family and the Book of Mormon they read, but in the end the central message of our religion is our Heavenly Father’s plan of happiness for His children and the Atoning sacrifice of His Son, Jesus Christ.
52,000 missionaries are currently serving in 350 missions around the world. They proselytize in every country where the government and political climate allow it. Many missionaries grow to love the areas in which they serve so much that they find it harder to come home after their missions are over than it was for them to leave in the first place. They return home as informed ambassadors of the nations and cultures where they served.
Reposted from http://mormon.org/missionary-work .