On the Order of Nature

With PARMENIDES began what is called, in more specific terms, true Philosophy. 
The Eleatic, and his Poem, constitute a "beacon" whose light illumined Plato and even Aristotle, and consequently all the philosophers that followed. 
Parmenides laid down several fundamental philosophical principles: 

1.    The Being as foundation of all the existent
2.    The principle of identity, Being is identical to ...