What a prodigious display of artifice, even in these simple and homogeneous parts! But if we consider the skin, ligaments, vessels, glandules, humours, the several limbs and members of the body; how must our astonishment rise upon us, in proportion to the number and intricacy of the parts so artificially adjusted! The further we advance in these researches, we discover new scenes of art and wisdom: But descry still, at a distance, further scenes beyond our reach; in the fine internal structure of the parts, in the economy of the brain, in the fabric of the seminal vessels.

All these artifices are repeated in every different species of animal, with wonderful variety, and with exact propriety, suited to the different intentions of Nature in framing each species.

And if the infidelity of GALEN, even when these natural sciences were still imperfect, could not withstand such striking appearances, to what pitch of pertinacious obstinacy must a philosopher in this age have attained, who can now doubt of a Supreme Intelligence! Could I meet with one of this species (who, I thank God, are very rare), I would ask him: Supposing there were a God, who did not discover himself immediately to our senses, were it possible for him to give stronger proofs of his existence, than what appear on the whole face of Nature?
What indeed could such a Divine Being do, but copy the present economy of things; render many of his artifices so plain, that no stupidity could mistake them; afford glimpses of still greater artifices, which demonstrate his prodigious superiority above our narrow apprehensions; and conceal altogether a great many from such imperfect creatures?
Now, according to all rules of just reasoning, every fact must pass for undisputed, when it is supported by all the arguments which its nature admits of; even though these arguments be not, in themselves, very numerous or forcible: How much more, in the present case, where no human imagination can compute their number, and no understanding estimate their cogency! I shall further add, said CLEANTHES, to what you have so well urged, that one great advantage of the principle of Theism, is, that it is the only system of cosmogony which can be rendered intelligible and complete, and yet can throughout preserve a strong analogy to what we every day see and experience in the world.

The comparison of the universe to a machine of human contrivance, is so obvious and natural, and is justified by so many instances of order and design in Nature, that it must immediately strike all unprejudiced apprehensions, and procure universal approbation.
Whoever attempts to weaken this theory, cannot pretend to succeed by establishing in its place any other that is precise and determinate: It is sufficient for him if he start doubts and difficulties; and by remote and abstract views of things, reach that suspense of judgement, which is here the utmost boundary of his wishes.

But, besides that this state of mind is in itself unsatisfactory, it can never be steadily maintained against such striking appearances as continually engage us into the religious hypothesis.