By all accounts, the modern ecumenical movement is not moving much these days. Despite dramatic breakthroughs in the past few decades, the quest for a visibly united church–in which there is common confession of the apostolic faith, full Eucharistic communion, and mutual recognition of members and ministers–now meets with indifference by many, impatience by some, and outright hostility by others. In part, this is because the movement has not given enough attention to grassroots ecumenical...