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However, when it comes to talking about psychic energy, the source of this energy cannot yet be quantified or analyzed, however, if we look at some theoretical knowledge of physics (something that Freud already mentioned in the Project for a scientific psychology, even if in a way subtle "First of all, there is no doubt that the external world constitutes the source of all the great amounts of energy, for, according to the discoveries of physics, it consists of powerful masses that are in violent movement and that this movement is transmitted by the so-called masses" p. 356). In this sense, it becomes fundamental and challenging to understand the role of quantum-mechanical physics for the mind-brain problem.