“Those who see evidence of God at work in the details of nature ponder the obvious yet astounding phenomena in the reproduction of plants and animals.
“In the reproduction of plants, a tiny seed is put in the ground, and a root comes out. Up through the root comes a stem, and then in succession come branches, twigs, leaves, flowers, and fruit, leading to new seeds, completely as if the seed knew the sequence of events or procedure to follow in order to create itself anew! What rational person could think that the sun, which is nothing but fire, knows how to achieve this? Or that the sun can empower its heat and light to bring about these developments? Is the sun capable of intending to be useful? Those with an elevated rational mind, when they see and consider these phenomena in the proper light, cannot help but think that these phenomena come from One whose wisdom is infinite—namely, God. Others as well who do recognize the divine handiwork in the details of nature find additional support for their belief in these phenomena.
“On the other hand, those who do not acknowledge that God is at work in nature move the eyes of their reason to the back of their heads rather than the front when looking at these phenomena. They are the type who derive every idea of their thought process from their bodily senses, and let themselves be convinced by false sensory evidence, saying, ‘You see the sun producing all these changes through its heat and light, don’t you? What is a thing you can’t even see? Is it in fact anything at all?’
“People who are strengthening their belief in the Divine take note of the astounding things they see in the reproduction of animals: Here I should first mention eggs as an example. In the seed of an egg there is a potential chick, together with everything required for its formation and for every stage it will go through after hatching until it becomes a bird just like its mother.
“Furthermore, if it considers flying creatures of every kind, a mind capable of deep thought will encounter stupefying things. For example, in the smallest thing that flies, just as in the largest, in the microscopic, just as in the plainly visible, in tiny insects, just as in songbirds and giant birds of prey, there are sensory organs of sight, smell, taste, and touch, and motor organs or muscles allowing them to fly and walk; and there are internal organs attached to their hearts and lungs that are activated by their brains.
from True Christianity, Volume 1, Section 12