The Spirits Book -- containing THE PRINCIPLES OF SPIRITIST DOCTRINE on The Immortality of the soul; the nature of spirits and their relations with men; the moral law; the present life, the future life, and the destiny of the human race. Defines the guidelines of the doctrine and clarifies its roots and relationship to similar or namesake doctrines.
If the phenomena we are considering had been limited to the movement of objects, they would have remained, as we have already remarked, within the domain of physical science; but so far was this from being the case, that they speedily proved to be only the forerunners of facts of a character still more extraordinary. For it was soon found that the impulsion communicated to inert objects was not the mere product of a blind mechanical force, but that it revealed the action of an intelligent cause, a discovery that opened up a new field of observation, and promised a solution of many mysterious problems.
From "The Spirits book" By Allan Kardec (1804-1869.