Although the theology of Tradition of the Dominican Yves Congar was highly influential in drafting the Dogmatic Constitution Dei Verbum at the Second Vatican Council, postconciliar debates neglected some of the most original aspects of this theology. This article proposes a retrieval of the notion of Tradition as ‘milieu éducatif’, advanced by the theologian in Tradition and Traditions, as a valuable resource for contemporary discussions on Christian formation. It intends to highlight how Congar connected the theological realities of revelation and its transmission by the Church with the concrete practice of Christian life. This notion is, then, put in conversation with contemporary Christian thinkers who have reflected on the practical aspects of Christian formation, chiefly James K.A. Smith. This dialogue aims to show the relevance of Congar’s notion to current discussions. While the theology of Tradition exposed by the French Dominican can be completed and specified by current proposals, it can also offer a new theological depth to those proposals.