The wisdom he was given to overcome deadly hostility, disease and linguistic/cultural barriers could only come from God. The quote that sticks in my mind was his short prayer to adapt the gospel message to the tribe:
"Jesus, become a Motilone"
The principle behind that prayer is pure compassion that God honors, as seen by how it was answered.
If you are even curious about mission work, get the book!
How Bruce survives, and reaches these people and how Jesus transforms them is an exciting and enthralling true story that is miraculous, humbling, and glorious. You won't be able to put this book down until you reach the end, and you'll wish for a sequel, as Bruce is alive and well today and still touching folks with the Gospel and transforming power of Jesus Christ.