There are no essential limits to human knowledge.
— Rudolf Steiner
Thinking...is 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...