According to canon law of the Catholic Church, there are essentially two things that are necessary for marriage to be considered a valid sacramental bond.
Fact of Faith
Facts of faith are great evangelization and teaching tools for your parish or school. With focuses on Church history, theology, saints, feasts, and seasons, these short documents can help answer many questions in your community. This material may also be included in bulletins, on web pages, or used on social media.