His grace is sufficent

You'll read that Edna and Paul Headland gave twenty-six years to the translation of the Scriptures into the Tunebo language. But it's not a simple project. You'll come to appreciate all that is involved in preparation, language learning, cultural adjustments, isolation, and loneliness. You will also be made more aware of what it means to be outside of Christ, without hope, as you get a glimpse of the culture and customes of the Tunebos. From foreword.