"We imagine that the Creator at the actual time of creation made only one single species for each natural order of plants, this species being different in habit and fructification from all the rest. That he made these mutually fertile, whence out of their progeny, fructification having been somewhat changed, Genera of natural classes have arisen as many in number as the different parents, and since this is not carried further, we regard this also as having been done by His Omnipotent hand directly in the beginning; thus all Genera were primeval and constituted a single Species. That as many Genera having arisen as there were individuals in the beginning, these plants in course of time became fertilised by others of different sort and thus arose Species until so many were produced as now exist... these Species were sometimes fertilised out of congeners, that is other Species of the same Genus, whence have arisen Varieties."

“I thank Providence who has guided my destinies, that I now live ; nay, that I live happier than a king of Persia. You know, fathers and fellow-citizens, that I am wholly occupied with this academical garden; that it is my Rhodus, or rather my Elysium. There I possess all the spoils of the east and the west which I wished for ; and which, in my belief, are far more precious than the silken garments of the Babylonians, and the porcelain vases of the Chinese. There I receive and convey instruction. There I admire the wisdom of the Creator, which manifests itself in so many various modes, and demonstrate it to others.”

“As a natural historian according to the principles of science, up to the present time I have been not been able to discover any character by which man can be distinguished from the ape; for there are somewhere apes which are less hairy than man, erect in position, going just like him on two feet, and recalling the human species by the use they make of their hands and feet, to such an extent, that the less educated travellers have given them out as a kind of man.”

“From my youth you have taught me, O God, and now I would like to proclaim Your Wonders”

“The observer of nature see, with admiration, that "the whole world is full of the glory of God.”

“I demand of you, and of the whole world, that you show me a generic character—one that is according to generally accepted principles of classification, by which to distinguish between Man and Ape. I myself most assuredly know of none. ...But, if I had called man an ape, or vice versa, I should have fallen under the ban of all the ecclesiastics. It may be that as a naturalist I ought to have done so.”

“Human beings, having, above all creatures, received the power of reason... need to be aware where nature is unaware. Nature reaches its culmination in humans, but human consciousness has not its essence in itself or nature.”