Where did this come from?

My oldest son called me this afternoon. Don't hear from him all that often. He lives in Savannah, GA with his wife and their puppy. He wanted to let me know he was leaving for Guatemala on Friday for a week of doing anesthesia for 12 hours a day. That got me to wondering; why does an almost newlywed, recently started a new job, with a wife undergoing chemotherapy, 29 year old decide to take a week off without vacation pay to travel to Guatemala to do volunteer medical missionary work? I'd like to think he was a perfect son, but I know better! Instead, I thank God he is listening to that still small voice who calls us to do unto the least of these...in Jesus name. My parents modeled this obedience when they went off to India in Dad's retirement for a 6 month stint teaching theology there. I have been to Mexico on several occasions working with a Seminary, mostly doing manual labor. In fact, all 4 of our sons have traveled to serve others in Jesus name. Our youngest spent a week in New Orleans last summer helping with the clean-up. Our second son and his wife serve fulltime in a closed country sharing the gospel. Our third son spent 5 months in Mexico as a self-supporting missionary working at that same Seminary I had been too (he actually lived on campus and learned Spanish by immersion). And our oldest, he's done this before. He's been to Mexico and Haiti on short term mission trips. Kinda makes you wonder, doesn't it, just what this world is coming to...or perhaps, who is going to the world in Jesus name?