The Power of Pity and Mercy
The Lord of the RingsThe theme of mercy is exemplified by Frodo's treatment of Gollum, which ultimately saves Middle-earth.
increasing
Bearing strength in each event
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Bilbo's Mercy

Bilbo's Mercy
The Chance to Kill Gollum
Bilbo finds the Ring and has the opportunity to kill Gollum. He feels pity and stays his hand.
The Consequences
Gandalf later praises Bilbo's mercy, saying it may have far-reaching effects. This sets the theme.
The Echo of the Choice
Frodo learns of Bilbo's mercy and is influenced by it.
Frodo's Mercy

Frodo's Mercy
The Capture of Gollum
Frodo captures Gollum in the Emyn Muil. He could kill him, but he feels pity.
The Oath and Trust
Frodo makes Gollum swear an oath to serve him. He trusts him despite Sam's warnings.
The Fulfillment of the Oath
Gollum's oath binds him, and he eventually leads them into Mordor. Frodo's mercy gives them a guide.
The Final Outcome

The Final Outcome
Gollum's Role in the Destruction
At the Crack of Doom, Gollum attacks Frodo and takes the Ring. He falls into the fire, destroying it.
The Mercy Justified
Gandalf's words come true: Bilbo's mercy and Frodo's pity allowed Gollum to survive and play his part.
The Lesson
Pity and mercy, not cruelty, lead to the victory over evil. This is a central theme of the story.
T.A. 2941, in the Misty Mountains
March 7, T.A. 3019, in the Emyn Muil
March 25, T.A. 3019