One of the oldest sources I found comes from Gleanings in England written by the clergyman Samuel Jackson Pratt in 1801.

Should a grey witch decide to join a coven, then she might have to swear an oath or make a pact with the group. I´d lke to point out that Tania knew nothing of this in advance so there was no way she could have "faked" the reading just to fit my situation. The practice of grey witchcraft requires no specific oath of creed, only the understanding of the forces at work. Amythyst was born in Los Angeles CA, raised in South Dakota, transplanted in mid-life to Nebraska to rear six of her children, and in her 60s she migrated to Arizona and set up house 40 miles from Phoenix.

Karma is a cosmic law which is like chewing gum in schools; adhering to it is optional, and you might get reprimanded, you might not. All in all, a good book for those who aren't afraid to bring down a hex or two upon a deserving head - but only when it is deserved. Often people are drawn to the path of the white witch for its promise to help aid in healing and growth. Duality has been pinned against each other since the dawning of time, a struggle of good versus evil a grey witch understands this.

Grey witches will always be happy to show you their love but aren’t afraid to hold back from a curse if you cross them.This however gives a greater insight and better understanding of why, how and when things are being, or have been, done.