Samhain was considered to be a moment when the veil between this world and the otherworld was at its thinnest...This was a liminal moment in the calendar, a time between two worlds, between two phases of the year, when worshippers were about to cross a boundary but hadn't yet done so. Samhain was a way of marking that ambiguous moment when you didn't know who you were about to become, or what the future would hold. It was a celebration of limbo.
~ Katherine May in WINTERING: THE POWER OF REST AND RETREAT IN DIFFICULT TIMES