In June 1920, the University of Cambridge honoured him with the degree of Doctor of Letters. In order that he might devote his full-time to the great new work he was preparing on ethics, religion, and sociology, the Collège de France relieved Bergson of the duties attached to the Chair of Modern Philosophy there. He retained the chair, but no longer delivered lectures, his place being taken by his disciple, the mathematician and philosopher Édouard Le Roy, who supported a conventionalist stance on the foundations of mathematics, which was adopted by Bergson. Le Roy, who also succeeded to Bergson at the "Académie française" and was a fervent Catholic, extended to revealed truth his conventionalism, leading him to privilege faith, heart and sentiment to dogmas, speculative theology and abstract reasoning. Like Bergson's, his writings were placed on the Index by the Vatican.