If I glance at the animal world, I find that all quadrupeds, and all wingless bipeds, reproduce their kind by the same process of copulation, and all the females are viviparous.
All female birds lay eggs.
In each species there is the same manner of reproduction and feeding.
Each species of plants has the same basic qualities.
Assuredly the oak and the nut have come to no agreement to be born and to grow in the same way, any more than Mars and Saturn have come to an understanding to observe the same laws. There is, therefore, a single, universal, and powerful intelligence, acting always by invariable laws.
No one doubts that an armillary sphere, landscapes, drawings of animals, or models in coloured wax, are the work of clever artists. Is it possible for the copyists to be intelligent and the originals not? This seems to me the strongest demonstration; I do not see how it can be assailed.
II
OF THE NECESSARY AND ETERNAL PRINCIPLE OF ACTION
This single mover is very powerful, since it directs so vast and complex a machine. It is very intelligent, since the smallest spring of this machine cannot be equalled by us, who are intelligent beings.
It is a necessary being, since without it the machine would not exist.
