The document discusses the promise made by Salesian Cooperators to live out the Project of Apostolic Life of the Association. It contains the prayer said when making the promise, in which the cooperator promises to be a faithful disciple of Christ, work in God's kingdom for the young, deepen and witness the Salesian spirit, and collaborate in the local church's apostolic initiatives. The document emphasizes that the promise commits the cooperator to the way of sanctity through sharing in the Gospel as traced by the Project of Apostolic Life.