"He commanded only two sailings, both after he had begun his religious studies--on the first, only six slaves died(and this was a time when even non-slave sailings often lost passengers and crew to disease), on the second, none, neither slaves nor crew, were lost."

Well, maybe (probably?) I'm an idiot, but the above info has not appeared in the dozen or so Newton sites I've looked at. So since McGrath of Harlow apparently knows exactly where this ubiquitous info is, s/he might kindly direct me to it?