Can someone please give me quotes from Lord of the Flies supporting the thesis: Jack imposes fear on the boys to remain powerful.this is my thesis...

In Lord of the Flies, Jack utilizes
"scare tactics" to ensure that most of the boys will view him as the most powerful boy
on the island.  Ralph, the elected leader, maintains that there is no beast on the
island; Simon, like Ralph, thinks that the children are wasting their time worrying
about the presence of a beast. 

Though it seems that Jack
is reasonable enough to know that there isn't a beast on the island, he does maintain
his authority by telling the others that if there is a beast, he will hunt and kill it. 
Since the children are so convinced that a beast does exist, Ralph's assurances that
there is no beast aren't good enough for them. 

During an
assembly in Chapter 5, Percival whispers to Jack that he believes the beast comes out of
the sea.  Instead of reassuring Percival that there is no beast, Jack voices Percival's
assertion to the entire assembly:

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Jack cleared his throat, then reported casually. 
"He says the beast comes out of the
sea."

With that, the
children's fears are justified, so they naturally gravitate toward a leader who vows to
catch and kill the beast.