“The core problem w/ Natural law, having hitched its wagon to reason, converts reason from an instrument to discover truth into a, indeed the, source of truth. Thus, we look to reason, not to revelation or divine authority to discover the truth. But this is to put the cart before the horse. ‘The true, the just are therefore that at which reason in its activity arrives, not what what it is; they are what is discovered through it and not from it. It sees the light and testifies of the light, but it is not the light and did not make the light. This is precisely what is wrong with rationalism: it turns the organ of truth into truth itself, and because of this, it thinks by dismantling and examining this organ it has obtained the content of the true, which this organ was supposed to convey’ (pg. 216). To view reason as the source of knowledge and truth is akin to believing ‘that corporeal instruments through which we receive food, actually are our food. Such a conception corresponds with rationalism’s procedure’ (p. 217).”
From the forward to Frdereick Stahl’s “The History of Legal Philosophy”