Cardinal Walter Kasper, who retired on July 1st as president of the Pontifical Council for Promoting Christian Unity, said his biggest regret is that he did not achieve an agreement on a common Communion with Protestants, ENI reports. “Today, there is a lot of convergence. So, we got closer to each other but we could not achieve the final breakthrough. I regret it very much but you cannot push the issue,” the cardinal said.