Ralph's speech in chapter five is his assertion of his leadership and role of chief; he feels his responsibility as leader keenly. Moreover, Ralph sees it as his duty to the other boys to facilitate their rescue and general well-being in any way possible. This moment comes shortly after Jack has led the other boys away from their post at keeping the fire lit and a potential rescue ship passed by the island.
Ralph reminds himself that this meeting must be all about business-- he reinforces the rules and does his best to remind the other boys that rescue must be their primary objective. Golding uses this scene in the novel to reveal Ralph's ties to civilization and his earnest belief in rescue, but also to affirm the morality of Ralph's character. Above all, he is a boy who wants to do the right thing and innocently expects the other children to share in his values.