The Basic Ecclesial Communities, being centered on the Sacred Scriptures, visibly manifest the essential elements of the ecumenical fraternity. The article illustrates their historical development and theological foundations. Then it analyses the ecumenical initiatives inspired by the decree on ecumenism. Further, it invites the readers to view them as expressions of ecumenically diversified unity on the essentials and promotes the dialogue of life, action, discourse, spirituality, and proclamation at the grassroots.