Henry Jackson

“ For, if the members of a natural kind had no common idea to unite them, scientific research, having nothing objective in view, could at best afford a λόγος or definition of the appropriate particulars; and, as the discrimination of the One and the Good implied the progression of particulars towards perfection, such a λόγος or definition could have only a temporary value. Hence, though, like Plato, Speusippus (4) studied the differences of natural products (5) with a view to classification, he did not agree with Plato in his conception of the significance of the results thus obtained ”

“ Hence Plato, finding in the school no capable representative of his ontological theory, might well choose to succeed him a favourite pupil whose scientific enthusiasm and attainment were beyond question; and Speusippus's rivals, having themselves abandoned the theory of ideas, would not be in a position to tax him with his philosophical apostasy. ”

“ Conceiving that the motions of the universe and its parts are due to the desire which it and they feel towards the supreme external mind and its several thoughts, so that the cosmical order planned by the divine mind is realized in the phenomenal universe, Aristotle thus secures the requisite unification, not indeed of mind and matter, for mind and matter are distinct, but of the governing mind, the prime unmoved movent, since it and its thoughts are one. ”