Today, the first Sunday after Pentecost, we celebrate Trinity Sunday, a feast day the universal Church has commemorated since 1334 A.D. In one sense, every Sunday is a festival of the Trinity because the whole Trinity is at work in every moment, brooding over chaos and calling forth life, catching creation up into the dance of renewal and transformation. Co-equal, self-giving, mutually loving, the ancient picture of the Trinity as a dancing circle, perichoresis, invites all humanity into the all-inclusive feast of belonging.