Missions can revitalize a spiritual life.
Your heart can be transformed when your focus is shifted off of your self and onto others. Your heart is open to so much more when you are out of your comfort zone and doing thing that stretch and challenge you.
The relationships with the people who you go on a mission with is deepened. The relationships you develop while on the mission will be blind to distance.
And it doesn’t stop when you get back home, once you come back you want to make an impact at home.
Every Christian needs to go on a Mission at least once in their life.