Let's say you're a Christian with a burden for a particular country or people.
You could spend over $5000 to go there on your own for ten days, paying for all your meals, cab fares, sigthseeing tours. And you might meet a few people.
Or, for a lot less, you could spend six weeks teaching conversational English to the very people you want to reach, and have all your needs there met by the school.
I've gone with ESI to China twice, and can attest to the complete training and support they provide to all their teachers, and know them as a family, not a business. My ESI experiences were the best part of my life. Why not check them out yourself?