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What is Spiritism? > Chapter II—Elementary notions of Spiritism > Concerning Mediums > 63
63. Therefore, it is a mistake to believe that it is enough simply to be a medium in order to receive communications from every spirit with the same ease. There are no more universal mediums for making evocations than there is a universal aptitude for inducing every type of phenomenon. Spirits prefer to look for instruments who vibrate in unison with them; if they were to impose themselves on the first to come along, it would be like forcing a pianist to play the violin, under the reasoning that if he or she knows music, he or she should be able to play every instrument.