Tomaso of Florence. known as Masaccio, showed by his perfect works how those who took their nourishment from anything but nature, mistress of masters, were laboring in vain.
Leonardo Da Vinci
Nature is the source of all true knowledge. She has her own logic, her own laws, she has no effect without cause nor invention without necessity.
The knowledge of all things is possible.
I expose to men the origin of their first, and perhaps second, reason for existing.
Reprove your friend in secret and praise him in public.
Man and animals are in reality vehicles and conduits of food, tombs of animals, hostels of Death, coverings that consume, deriving life by the death of others.