This is one of my favorite quotes.  It is taken from, "The Forest House."  This a book by Marion Zimmer Bradley.  It is a prequel to, "The Mists of Avalon."

"The enemy you would conquer, you must love...

The law you would fulfill, you must defy...

The thing you would keep, you must now give...

Thus will you have the victory...

Daughter of the Druids, through you the Dragon will be reborn."