When we visited the ACTION team in Zambia, we learned this story from Glenn & Liese Ripley.

Last year we (Glenn & Liese Ripley) visited Gulu, Uganda to see our ACTION missionaries, Jerry & Candis Bingham. The Binghams have a wonderful ministry working with the "invisible children" from the LRA conflict and training pastors in northern Uganda. One evening we were there, Candis spoke to the children about how much God loves them. She had been searching for some way to help them remember God's love, even on nights when they were completely alone, without any possessions, and in complete darkness, and had hit on the idea of using our thumbs as the perfect symbol. "I thought about tying a string around the children's wrist, but I knew that wouldn't last," she explained. "And then I realized thumbs are something every child has and that their own thumbs could be a perfect reminder!"
She went on that night to teach the children how much Jesus loved them and that they could grasp their thumb, even when they were scared and alone, and remember that love. They could also hold out their thumbs to others to say "Jesus loves you!" And so all of us practiced, first with one thumb pointed back at ourselves "Jesus loves me!" and then holding out our thumbs to our friends, "Jesus loves you!" It was definitely a night to remember.
So when we arrived at a Bible Club way out in rural Malawi (and I do mean 'way out'), and I was asked to say something to the kids, "thumbs" was the first thing that came to my mind! So there I was, an ambassador from Zambia, with a message designed in Uganda, for these precious kids in Malawi! Thanks, Candis! Maybe one day we'll see kids in countries all over Africa holding their thumbs with big smiles, knowing that they belong to the Lover of our Souls!
When Liese and Megan dropped us off at the airport as we were about to leave Zambia, they waited in the lobby area until we had passed through the baggage check and immigration. Just before we left the area to go wait for our plane, I turned around and saw them on a stairway where they could see into where we were. They kindly waited to be sure that everything had checked out ok for us and we were cleared. When I waved good-bye to them, they both held their thumbs up. They communicated -- "Jesus loves me!" I gave them a thumbs up in return. I'm not a child suffering cold, alone, afraid, wounded and hungry like so many of the children we work with in our respective countries. But I do need to know that Jesus is the lover of my soul. How blessed I am!
All Thumbs to you too.