Genius detects through the fly, through the caterpillar, through the grub, through the egg, the constant individual; through countless individuals the fixed species; through many species the genus; through all genera the steadfast type; through all the kingdoms of organized life the eternal unity. Nature is a mutable cloud which is always and never the same.
But nothing is more estimable than a physician who, having studied nature from his youth, knows the properties of the human body, the diseases which assail it, the remedies which will benefit it, exercises his art with caution, and pays equal attention to the rich and the poor.
God manifests himself to us in the first degree through the life of the universe, and in the second degree through the thought of man. The second manifestation is not less holy than the first. The first is named Nature, the second is named Art.
Monotony is the law of nature. Look at the monotonous manner in which the sun rises. The monotony of necessary occupation is exhilarating and life giving.
The Laws of Nature are just, but terrible. There is no weak mercy in them. Cause and consequence are inseparable and inevitable. The elements have no forbearance. The fire burns, the water drowns, the air consumes, the earth buries. And perhaps it would be well for our race if the punishment of crimes against the Laws of Man were as inevitable as the punishment of crimes against the Laws of Nature -were Man as unerring in his judgments as Nature.
You must not know too much or be too precise or scientific about birds and trees and flowers and watercraft; a certain free-margin , or even vagueness - ignorance, credulity - helps your enjoyment of these things.
"In the woods we return to reason and faith. There I feel that nothing can befall me in life~~no disgrace, no calamity (leaving me my eyes), which nature cannot repair."
If we would have our citizens contented and law-abiding, we must not sow the seeds of discontent in childhood by denying children their birthright of play.