Candle of Love
The Candle of Love is an object, like the Book of Truth and the Bell of Courage that embodies one of the three principles.
The Candle of Love has been seen in-game, during a scenario wherein the characters fought against the minions of Astaroth, the Shadowlord of Hatred. From completing a quest, characters could receive candle "blessed by love." This candle was personally blessed for the character finishing the quest.
For more on this quest, see The Candle of Love, and the other articles on that quest chain, which began with the The Darkness quest.