During this time immense work was accomplished, which was to fertilize the whole Slavic world. But the immediate work of the brothers fell to pieces among the western Slavs after Methodius’ death. They could not hold off German pressures, and Pope Stephen, who could not understand the policy of his predecessors, simply liquidated the whole Slavic mission.

The disciples of Methodius were driven out of Moravia, and only in the nineteenth century, during a time of Slavic renewal, did the work of Cyril and Methodius again become a rallying point for national liberation and western Slavic culture.

Alexander Schmemann, A History of the Orthodox Church