around 1906, peirce reaffirmed some of the above forms of immortality, but added, "if i am in another life it is sure to be most interesting; but i cannot imagine how it is going to be me. at the same time, i really don't know anything about it," and that mental action's dependence on the brain was an assumption warranted in science by facts until contrary facts come to light, but from the standpoint of practical interest the dependence remained open to some doubt.