Of the Blue little was known in the West ... for they passed into
the East with
Curunír, but they never returned, and whether they remained in the East, pursuing there the purposes for which they were sent; or perished; or as some hold were ensnared by
Sauron and became his servants, is not now known. But none of these chances were impossible to be; for, strange indeed though this may seem, the
Istari, being clad in bodies of
Middle Earth, might even as
Men and
Elves fall away from their purposes, and do
evil, forgetting the good in the search for power to effect it.