It is simply too dangerous to leave life to chance. To do so would be to invite disaster. Luck must never be taken for granted. One can never assume. It requires constant courtship, demands undivided devotion.
Up until the patriarchal revolution, both Fridays and 13s were held in the very highest esteem. Both the day and the number were associated with the Great Goddesses, and therefore, regarded as the sacred essence of luck and good fortune.