Diogenes of Apollonia

“ Yet no single thing partakes in it just in the same way as another; but there are many modes both of air and of intelligence. For it undergoes many transformations, warmer and colder, drier and moister, more stable and in swifter motion, and it has many other differentiations in it, and an infinite number of colours and savours. And the soul of all living things is the same, namely, air warmer than that outside us and in which we are, but much colder than that near the sun. And this warmth is not alike in any two kinds of living creatures, nor, for the matter of that, in any two men ”

“ At the same time, it is not possible for any of the things which are differentiated to be exactly like one another till they all once more become the same.
(6) Since, then, differentiation is multiform, living creatures are multiform and many, and they are like one another neither in appearance nor in intelligence, because of the multitude of differentiations. At the same time, they all live, and see, and hear by the same thing, and they all have their intelligence from the same source. ”

“ I give them as they are arranged by Diels:
(1) In the beginning any discourse, it seems to me that one should make one's starting-point something indisputable, and one's expression simple and dignified. ”