I once met and stayed in the home as a guest of a brother who was a retired lawyer (litigation) and had served at bethel for three years doing legal work voluntarily.
He had very interesting things to say, but boy do I wish I could have asked more. That was like 20 years ago or more. I was too naive then to know any better.
We went in service together the following day and he said that the field ministry wasn't for the householders - it was for the witnesses. That statement never really clicked until recently.
There is no telling what i could have learned from that man. He is probably dead now.