 Boyle was troubled throughout his life by the fragmentation of Christianity. Among “the giddy multitude … this multiplicity of religions will end in none at all,” he wrote to John Mallet in  1652,[14]  and at the very end of his life he expressed in his Will the wish that the Boyle lecturers should, when “proveing the Christian Religion against notorious Infidels (viz), Theists, Pagans, Jews and Mahometans, not [descend] lower to any Controversies that are among Christians  themselves.”[15]