In the encyclical Fratelli Tutti (2020), Pope Francis has offered a synthesis of his Magisterium. From its pages there emerges a “new dream” for humanity: a call to walk together, to join forces in building a more just and united world, and thereby to generate a better future for all. In introducing an in-depth reading of Francis’s themes, the authors begin by tracing his continuity with the themes and social teaching of the Second Vatican Council. In the second part, they highlight his original contributions, especially in Fratelli tutti. Out of this constant dialectic with the tradition, the truth of “siblings all” appears as a “sign of the times” for our age, and a way for the Church to proclaim and transmit the Gospel to the contemporary world.