Summary:

• It demonstrates that Joseph had more than a passing fascination with magic as a teen.
• If Joseph really did have it on his body when he died then it shows he was still very much interested in magic.
• The purpose of such a talisman was supposedly to help the owner have influence over others, become rich, and powerful, and find peace among other things.
• The inscription comes directly from "The Magus" which was a magical book by Francis Barrett.