We're on an island. We've been on the mountaintop and seen water all round. We saw no houses, no smoke, no footprints, no boats, no people . We're on an uninhabited island with no other people on it.
A snake-thing. Ever so big. He saw it. In the woods.
Now we come to the most important thing. I've been thinking. I was thinking while we were climbing the mountain. And on the beach just now. This is what I thought. We want to have fun. And we want to be rescued.
During this scene, the boys are at a meeting and Ralph is informing them that they are the only ones on the island. Knowing this, the boys are going to create a plan to survive.
Within this scene, it is the first time Beastie is ever mentioned in the book by the boy with the birthmark on his face.
During his speech, Ralph is explaining his idea of how the boys can have fun, but they also need to develop a plan to be rescued because they cannot stay on the island forever.