The 4th and last law of witchcraft: revealing one's magic to those who do not believe in it or wish it to fail can make it fail. Secrecy is often the best protection and you must choose your confidants carefully.

Earth governs stability, foundations, nature. It represents material, stones, crystals, metals.  The other three elements are present in the Earth, allowing their physical representations.  

It is up to you to seek in the treasures of our Mother Earth all the secrets for your magic: candles, incense, plants, stones, crystals and talismans. And keep it a mystery.