There are no essential limits to human knowledge.
— Rudolf Steiner no more and no less an organ of perception than the eye or the ear. Just as the eye perceives colours and ear sounds, so thinking perceives ideas.
— Rudolf Steiner

Link these quotes to discussion on materia media, the old texts and herbal medical foundations - homeopathy, flower essence in more modern times - natives and how they have hundreds of words to describe a plant and we only 2 words...