Living in community is an art. Are there role models for this? Yes! A well-established and committed community is the Offensive of Young Christians (OJC), a family community within the Protestant Church. Founded in 1968 by young pioneers, after 40 years of shared life, what has held the fellowship together has now been documented. It reflects what has sustained them in their actions, love, and failures. The Grammar of Companions is a reading book for those who want to live their faith in community in an infectious and committed way. It is not a set of rules, but rather an inspiration; not a directive, but guidance based on reflected experiences from the practice of communal living.