"Some missionaries may wonder whether they are in the right place, in the right mission. It is no accident for them to be where they are assigned. The Lord knows the missionaries. He knows their mission presidents. I think He knows who their companions will be. I don't know the detail to which He knows the future, but my impression is He knows a great deal. He calls missionaries to the places they are assigned. So, even when it's difficult, you can have confidence that the Lord knew the difficulty in advance, and just as He assured Nephi that He wouldn't give a commandment save He prepared a way for it to be accomplished, missionaries can have that same assurance, tough as it may be, whatever the situation, that the Lord knew the difficulties would be there. He has prepared a way. Have faith. Go forward."
Henry B. Eyring, "To Know the Truth," New Era, May 2004, 9
"All of us who have received the holy priesthood bear the sacred obligation to bless the nations and families of the earth by proclaiming the gospel and inviting all to receive by proper authority the ordinances of salvation. Many of us have served as full-time missionaries, some of us presently are serving as full-time missionaries, and all of us now are serving and will continue to serve as lifelong missionaries. We are missionaries every day in our families, in our schools, in our places of employment, and in our communities. Regardless of our age, experience, or station in life, we are all missionaries."
David A. Bednar, "Becoming a Missionary," Ensign, Nov. 2005, p. 44
“You see, we don’t proselyte in this Church just to make the Church larger. We proselyte to make the person larger—more whole, more complete, more certain in the knowledge that there are eternal things. We bring the power of the atoning blood of Jesus Christ through the ordinances so that eternal blessings can come and also that ‘there might not be more sorrow upon all the face of the earth.’ We err when we count this Church’s progress through numbers only.”
L. Aldin Porter - BYU Speeches, 1994-95, p. 119
"There is neither man or woman in this Church who is not on a mission. That mission will last as long as they live, and it is to do good, to promote righteousness, to teach the principles of truth, and to prevail upon themselves and everybody around them to live those principles that they may obtain eternal life."
Brigham Young
"Missionary work will help those of us battling against addictions and bad habits and are struggling to feel worthy, to stand blameless before God, to become forgiven of our sins, and to have the strength to keep God's laws. It doesn't just demand our purity. It will help us be pure."
"The Power of Everyday Missionaries" - Clayton M. Christensen