In this article it is argued that insights gleaned from John Calvin’s and Martin Bucer’s missionary passion and vision are relevant to contemporary missional churches in times of crises. First, Calvin’s manifold personal crises in the 16th-century context were explored historically. Subsequently, modern missiologists and historians’ views were critically engaged to ascertain how we could properly interpret the Reformers’ missionary vision without drawing oversimplified and anachronistic conclusions. The widespread misrepresentations that often downplay the Reformers’ resilient missionary vision were invalidated by explicating their lucid mission-mindedness during their time. It is indicated that much can be learned from their identity and p...