Sometimes, the wisest move is not to move at all.
Because there is so much more work to do than most missionaries have time in which to do it, they are tempted to spread themselves too thin. They spend more time on the work of the Lord and less time with the Lord of the work. Excitement over their progress camouflages their growing spiritual anemia.
Jesus set the example for healthy rhythm. He would spend himself in ministry and then retreat to spend time with his Father. He never allowed his calling to take a toll on his relationship. He consolidated his progress by maintaining a vital link with the Father who sent him.
Moving ahead too quickly can result in the “mile-wide-inch-deep” syndrome. It looks impressive from 30,000 feet, but at ground level – not so much. How is your missionary friend doing?