"Scientific laws, says Boutroux, result from the collaboration of the spirit and things; they are the product of the activity of the spirit applied to a foreign matter; and they represent the effort that the spirit makes to establish a coincidence between things and itself. But what coincidence is this, where it is not known with what thought must coincide? He rightly says that the highest forms of reality cannot be resolved into the lowest; but then he resolves into the lowest... precisely thought, that is, the very thought that alone can make us understand progress from below to above. Consequently, progress is clouded in the void of contingency, and all forms of reality become things in themselves, which thought can do nothing but shadow in its concepts, trying in vain to adapt to them. (Guido De Ruggiero, La filosofia contemporanea, Editori Laterza, Bari, 19648, Part II, Ch. IV, p. 191)"