Gaea: I can summon the giants and take over the world by force.

Percy: Well, yeah, you could. Yeah, you could do that, of coarse you could. But why? Look at these people: these human beings. Consider their potential. From their arrive on the planet, and blinking step into the sun. There is more to see than what has ever been seen. More to do than- no, hold on... Sorry, that's the 'Lion King'. But the point still stands.