No Christian and, indeed, no historian could accept the epigram which defines religion as “what a man does with his solitude.” It was one of the Wesleys, I think, who said that the New Testament knows nothing of solitary religion. We are forbidden to neglect the assembling of ourselves together. Christianity is already institutional in the earliest of its documents. The Church is the Bride of Christ. We are members of one another.
From The Weight of Glory by C S Lewis