The method is a kind of "beacon that illuminates" a certain path, but, if it is true that "in science there are no real roads", one would think that even with good illumination one would not be able to distinguish any path. So, how to affirm that the method is important to get to a good port? On the one hand, the fact that science exists as a constituted science forces us to take a deductive position by way of epistemological honor of those canons that have become pillars of human knowledge. Subsequent human generations do not repeat what has already been achieved by previous generations, but rather build on previous steps to ascend to a higher level. On the other hand, that there are no roads, does not mean that there are no paths for the scientific journey. Not real, means that it is not done, that it must be built while walking. It presupposes a crossing not factically available, but potentially available, positively achievable; it expresses that the target, although in draft form, can be appreciated on the horizon and can be reached. Already the great Aristotle spoke of the passage from potency to act.