<p>This book is the culmination of a long companionship, a final link between a historian familiar with theology and a theologian keen on history. It was in February 1966 that Etienne Fouilloux met the Dominican theologian Yves Congar for the first time. He then began a thesis on the origins of ecumenism. Congar liberally opened his personal archives to him. For fifteen years, Congar did not leave the horizon of Fouilloux. Congar attended the def...