I'm currently reading a book written by Seth Barnes, the founder of the World Race.
It's called Kingdom Journeys and it's all about taking a long term mission trip, leaving your life behind, and following God's call.

So many people ask me about the Race and it becomes a habit to tell them about the travel and the projects and everything we'll be doing, but as I was reading today I found something that explains going on the World Race so much better than I could.
It goes deeper than just working with orphans or prostitutes in the Red Light district. 
I wanted to just type it out so that it could help those who don't know what the World Race is to better understand and help those of us preparing to go on this Kingdom Journey to understand what we're really getting ourselves into.

pg 69

"Simply surviving can be uncomfortable at times. When you lose your routine, you lose control. Abandoning your safe, little world makes you vulnerable. In this sense, you become like a child again. Everything seems new again. By leaving what we trust and know, we begin in trust and know new things. We learn to rely on a Father who does not abandon his children, to really open ourselves up to his love. Ultimately, we learn to obey as we never have before

Becoming a child again is exactly what God wants. This is the point of abandoning. He wants us to look at the world through new eyes, eyes that see beauty and joy and excitement in all things, even the most ordinary circumstances. He wants us to give up our control and to trust Him. Abandoning reminds us to be childlike in the middle of life at a time when we've long forgotten what it's like to be a child. THIS IS WHY WE LEAVE; IT'S WHY WE GO ON A JOURNEY IN THE FIRST PLACE.

As part of the abandonment process, God asks us to give up control and remain open to new things. We leave as an act of obedience so we can learn to depend more on God, allowing him to increase our spiritual vision. Jesus said that when the eyes are healthy, the whole body is full of light (Luke 11:34). ABANDONMENT CAUSES OUR EYES TO OPEN WIDE."