To say, therefore, that the imagination of the man is free, does not mean to affirm that it enjoys of being able absolute, for the opposite, the combinatria capacity characterizes that it is far from being limitless. However, even so our thought seems to possess this limitless freedom, will verify, through a minute examination mai that it really is confined inside of limits very reduced and that all creative power of the spirit not it exceeds the college to combine, to transpose, to increase or to diminish the materials that had been supplied in them by the directions and the experience. (HUME, 1996, P. 36) Therefore, he is well-known that the materials of the thought are derivations of our external or internal sensations, that is, what it has in the thought are only sensations that we abstract from some objects, and, in creative way we form diverse combinations. Being that the formed combinations possess dependence of the spirit and the will organize that them.
2.1.Associao of ideas Is for the association of ideas that Hume of the account to explain, because the imagination although to be free, in general proceeds from regular way, and because the ideas although its independence has certain ordinance. For it, the association of ideas is guided by three principles: similarity (representation), proximity (extension) and causalidade (association). Acting on imagination, the three offer or supply to coherence and regularity to the immediate data of the directions and the ideas of the memory. They are the responsible ones for the fact of that in general the same simple ideas if congregate in the same complex ideas. The first one, similarity principle is objects that if resemble one to another one, as example makes me to a photograph to come the mind the personage who represents. As, principle of proximity if a historian try to write the history of the Europe during a century would be, therefore, influenced for the connection of proximity in the time and in the space and third, causalidade principle (cause and effect), idea excites me to the cause of effect and live-turns, for example, when thinking about a wound, hardly we abstain in them from the pain that the same one provokes or when thinking about the fire, inevitably I am taken thinking about the heat or then about smoke that of it if unfastens, and live-turns. .