Primary biographical sources like this one are a treasure, especially when the biographer was one of the closest friends of the person he wrote about, like this one. Beza's love for Calvin as a brother in Christ, a pastor, a friend, and fellow laborer is a blessing. An added bonus is Beza's summaries of all the written and spoken defenses Calvin did for true doctrine (including a complete list of every heretic or disputor that crossed paths with Calvin). I loved the (small!) section about his wife.