Living in community is an art. Are there any models for this? Of course! A guaranteed binding community is for example the Offensive of Young Christians (OJC), a family community in the Protestant Church. Founded in 1968 by young savages, it was written down after 40 years of living together what held the fellowship together. And what it has carried through in its work, love and failure. The Grammar of the Companions is a reading book for people who want to live their faith in community in a contagious and binding way. Not a set of rules, but stimulation; not instruction, but directive, based on reflected experiences from the practice of living together.