The mediums of Brazilian possession cults contrast gifts with initiati
on. This contrast can bee understood by studying how scientific and es
oteric writings have shaped this religious field. Writings based on sc
ientific paradigms have defined ritual norms that the initiatory syste
m supposedly maintains. Having failed in their attempst at systematiza
tion, esoteric writings have encouraged personal interpretations based
on inspiration by the spirits. The forming of a religious <<tradition
>> can be understood only by taking into account the ambivalent relati
ons between speech and writing.