With all of the expert commentary that has been printed since Spinoza's lifetime and all of the additions which have been made to our understanding of Baruch's unparalleled contributions to human knowledge, one of his most amazing discoveries has gone completely unmentioned. Due to the across the board acceptance of empirical science's determination that the physical brain is essentially the seat of our intelligence, Baruch's declaration that our intellect is not a physical but rather a mental entity still remains hidden to our view. In this Pamphlet 3 from the series Spinoza's Ethics Examined in Detail, we will investigate each and every Proposition to see if together we can discover and decide once and for all whether the mind exists on its own power. If you have harbored any doubts as to whether your thinking capability can truly be relegated to a bio-electro-mechanical process, then come along and see for yourself what the esteemed person from 350 years ago said about the human mind.