It isn't that a warrior learns shamanism as time goes by; rather, what he learns as time goes by is to save energy. This energy will enable him to handle some of the energy fields which are ordinarily inaccessible to him. Shamanism is a state of awareness, the ability to use energy fields that are not employed in perceiving the everyday-life world that we know.
Carlos CastanedaWhenever a warrior decides to do something, he must go all the way, but he must take responsibility for what he does. No matter what he does, he must know first why he is doing it, and then he must proceed with his actions without having doubts or remorse about them.
Carlos CastanedaA rule of thumb for a warrior is that he makes his decisions so carefully that nothing that may happen as a result of them can surprise him, much less drain his power.
Carlos CastanedaMy benefactor said that when a man embarks on the paths of sorcery he becomes aware, in a gradual manner, that ordinary life has been forever left behind; that knowledge is indeed a frightening affair; that the means of the ordinary world are no longer a buffer for him; and that he must adopt a new way of life if he is going to survive. The first thing he ought to do, at that point, is to want to become a warrior.
Carlos Castaneda