This is a beautiful essence, and a very powerful one. It bears the soul and helps you to truly look inside and see yourself as you are. With all your positive and negative aspects. It stimulates dreams and concentration.
To the native Americans, obsidian is a powerful magical stone. It grounds the powers of the mind and furthers decisiveness. This is not always a gentle process and can be quite confrontational. But sometimes a thorough cleansing is neccessary to enable further growth.
After using Dark and Light, it is advisable to use the Bright Light remedy for a while to bring back the light.
Because of the power of the obsidian this is always a remedy you choose for yourself and that can never be prescribed to someone with the intention 'well, mate, you need to take a good look at yourself', however tempting it can be to shove someone a mirror in their face.
Besides, you can shove someone a mirror in their face, but there's still the question whether they the same thing you see. Maybe they are your mirror and there is something in yourself that you are overlooking, or maybe they have come into your life to teach you how to deal with certain situations....