“The natural size of a coven is one. Witches only get together when they can’t avoid it.” Wyrd Sisters
“They say a little knowledge is a dangerous thing, but it is not one half so bad as a lot of ignorance.” Esmeralda (Granny) Weatherwax in Equal Rites
These two quotes fit quite nicely after posting A Solitary Practitioner, but Not a Lonely Witch. The second one made me laugh for a while. I imagined Granny's expression as she said those words, and I couldn't keep myself from roaring like a loon.