Geordi La Forge: The unique properties of thalaron radiation allow the energy beam to expand almost without limit. Depending on its radiant intensity, it could encompass a ship... or a planet.
William Riker: He would only have built a weapon of such scope for one reason.
Jean-Luc Picard: He's going after Earth.
Deanna Troi: How can you be certain?
Jean-Luc Picard: I know how he thinks.
William Riker: Destroy humanity, you cripple the Federation.
Jean-Luc Picard: The Romulans invade.
Picard tells his crewmen that Shinzon wants to destroy earth.