Ever since I first read these books as a child (or teenager? Don't remember!), these lines have been engrained in my memory:
"When the Dark comes rising, six shall turn it back;Three from the Circle, three from the track;Wood, bronze, iron; water, fire, stone;Five shall return, and one go alone.
Iron for the birthday, bronze carried long;Wood from the burning, stone out of song;Fire on the candle ring, water from the thaw;Six Signs the circle and the grail gone before.
Fire from the mountains shall find the harp of goldPlayed to wake the Sleepers, oldest of the old;Power from the green witch, lost beneath the sea;All shall find the light at last, silver on the tree."