Lock Your Heart

While on a mission tour in Latin America in 1968, then-Elder Spencer W. Kimball gave a rather stern talk to a group of missionaries.  If you haven't read this before, read it now.  If you have read it, read it again.

http://missionaryhelper.com/talks/lockheart.html

This advice to lock your heart is important, not just on a mission, but also after you get married.  Certain activities may seem innocent, but if persisted in they can lead to trouble.

One of my district leaders told me a story one day.  When he arrived in the mission field, and had his first interview with the mission president, he found a name tag stuck in the couch in the president's office.  The elder it belonged to had been the highest number of baptisms in the mission, yet he was sent home early for an indiscretion.  This elder had engaged in activities which initially seemed innocent and harmless, but as he persisted he soon found himself in a situation that quickly got out of hand.