I am enjoying reading Barth’s letters from the final years of his life - Karl Barth: Letters 1961-1968 (Edinburgh: T&T Clark, 1981) - and came across another gem recently. This one concerns the heart of the ecumanical project, and in particular the possibility of closer ties between Reformed Protestantism and the Roman Catholic Church. In a written reply to The Institute of the Sacred Heart of Mary, Belgium, in 1962 Barth thanked the sisters there for their initial contact with him, and their feedback on his own theological work. He then comments on their corrspondence - they must have said something about the importance of loving one another - and he writes, 'You are right to tell me that much of the route to the unity of the church is laid when we come together again in love. Being the friend of many Roman Catholic theologians, I add that I am happy to affirm that in truth as well we have come closer on both sides than could ever have been imagined fifty years ago.