The very recent publication of an Ecumenical Vademecum/Guidebook by the Pontifical Council for Promoting Christian Unity is an occasion for Catholics to look again at our ecumenical commitment, especially in this month when we celebrate the Week of Prayer for Christian unity (18-25 January). While the Vademecum, available on-line, is specifically focussed on reminding bishops of the priority of ecumenism, it is indirectly addressed to all of us, inviting us to rekindle the passion for unity that the Spirit has underlined through the ecumenical movement. The search for unity, we are reminded, is intrinsic to our identity as church.