Dr. Spencer Reid:  Guys , I think these numbers are dates . If you reverse them and chop off the 11 at the beginning and end ...
Aaron Hotchner: That 's two days after each woman went missing .
Dr. Spencer Reid: It 's more than that , though . Look . March 1st is Saint Eichatadt day . March 21st is the spring equinox , and the 24th is the Feast of the Beast . All important holidays in the Satanic calendar for sacrifices .
Derek Morgan: What about the _ 11 _ on the end ?
Dr. Spencer Reid: To many occultists 11 is symbolic of Lucifer .
Jennifer Jareau: Okay , I thought we were moving away from Satanic killings .
Aaron Hotchner: Apparently we need to reconsider .
Dr. Spencer Reid: There 's got ta be some sort of connection to the Devil here .
Aaron Hotchner: Reid , what other upcoming dates are significant to Satanists ?
Dr. Spencer Reid: Good Friday , then Easter eve . Then preparations begin in mid - April for the most important holiday of all , Walpurgis Night on April 30th .