Molly knew what Buffy meant. Once you opened Pandora's Box you couldn't go back and once you exposed people to what was out there, they couldn't unsee it.

"I hid my magic from my parents for a long time. Dad even had a connection to the Supernatural but I still didn't tell them." Molly wasn't sure why she hadn't told them, thinking back on it, beyond she liked having the secret. "I kinda liked being different and them not knowing."