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What is Spiritism? > Chapter II—Elementary notions of Spiritism > Concerning Mediums > 67
67. Since mediums cannot impose themselves on the spirit they want to evoke, it behooves the spirit itself to choose its own instrument. In any case, the medium must identify beforehand with the spirit through concentration and prayer, at least for a few minutes, and even for a few days, if possible, in order to induce and activate the fluidic assimilation. This is the way to attenuate the difficulty.