“You must recognize that missionary service is emotionally demanding. Your support system is going to be withdrawn from you as you leave home and go out into the world. … Learn now about your emotional limits, and learn how to control your emotions under the circumstances you will face as a missionary.” — Elder L. Tom Perry
Elder L. Tom Perry

Elder L. Tom Perry, of the Quorum of the Twelve Apostles
Raising the Bar · October 2007 general conference
Especially for missionaries and parents and families