What are some examples from the text and explanations showing Julius Caesar's ambition?Cite any explanations from the play Julius Caesar

In Julius Caesar, when Caesar espies
Cassius, he becomes anxious about his power being threatened; he tells
Antony,

Let
me have men about me that are fat,

Sleek-headed men, and
such as sleep a-nights.

Yond Cassius has a lean and hungry
look;

He thinks too much:  such men are dangerous....Such
men as he be never at heart's ease

Whiles they behold a
greater than themselves
(l.2.198-215)

In Act I, also,
Casca tells Brutus that Caesar refused a crown three times when Marc Antony offered it
to them.

...I
saw Mark Antony offer him a crown--and, as I told you, he put it by once; but for all
that, to my thinking, he would fain have had it.  Then he offered it to him again; then
he put it by again; but to my thinking, he was very loath to lay his fingers off it. 
And then he offered it the third time.  He put it the third time by; and still as he
refused it, the rabblement hooted, and clapped their copt hands, and threw up their
sweaty
nightcaps....(1.2.241-250)

If
Caesar were not hungry for power, he would not make such a show of refusing the crown,
Casca argues.  Casca states that Caesar has fallen in the market place,
but

before he
fell down, when he perceived the common herd was glad he refused the crown, he plucked
me ope his doublet and offered them his throat to cut.....When he came to himself again,
he said, if he had done or said anything amiss, he desired their worships to think it
was his
infirmity.(1.2.267-274)

Cassius
contends that Caesar's theatrics are meant to trick the people, in his desire to win the
people over in his desire for property.  Cassius blames the people for allowing Caesar
to become so powerful:

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...if Caesar had stabbed their mothers, they
would have done no less.
(1.2.277)

Anxiety about
anyone else who looks eager for advancement, dramatic about being the "mighty Caesar" of
the people--these are the arguments that Cassius and Casca use to convince Brutus that
Caesar desires to be powerful, words to convince Brutus that Caesar will become a
tyrant.