There are so many things I could write here about Don. Yolande (my wife) has called him a "spiritual giant," so I'll share a vignette that illustrates this. In my young adulthood, when I was a young believer, Don told me about a time he had been accepted into a Ph.D. program in ornithology, but that he had decided not to start the program after all. When I asked him why, he said, "Just because there's an open door, it doesn't mean that the Lord wants you to walk through it." At the time he had applied for the Ph.D. program, he had thought that was what he was supposed to do, but in the meantime, the Lord had convinced him that was not the path he should follow after all.
Several years later, Yolande and I were part of a small church where a man had received a job offer that he wanted to take but that would require him to quit his then-current job, uproot his young family, and move to a place several hundred miles away, where they knew no one. Neither his wife nor his kids wanted to move, and it became apparent that the reason he wanted to move was because of a higher salary. He accepted the job and spent several weeks away from his family, coming back to visit on some weekends. Eventually, the family moved. We don't know what happened next, but I remembered what Don had said several years before, and I wondered if the man should have walked himself (and his family) through that open door. I determined that I would not make such an important life-changing decision unless I was confident that Yolande and I were in agreement about it.