Parmenides commentary II: Thinking and Being
What is there for thinking and for Being is the same.
Parmenides seems to be suggest here that thinking is not an activity that separates oneself from the whole of existence. The thinker and that which is thought are both unified through the act of thinking. In the context of Parmenides, thinking is an ontologically unifying activity—thinking arises out of Being, the cosmos being aware of itself.
Parminides is critical of the common view of change—something comes into existence, then it goes out of existence. Thinking, for Parmenides, means looking at existence from a larger perspective: nothing is created and nothing is destroyed, things do not exist separately from one another.
Parmenides then proceeds to explore the implications behind his two principles: Being Is and Nothingness Is Not.