You are Cassius: Write a diary entry showing how you were convinced that the murder of Caesar was justified.Julius Caesar by William Shakespeare

First and foremost, Cassius is, as Caesar himself has
recognized, a young man who "has a lean and hungry look" (I,ii,194).  Thus, he is
ambitious, envious, and self-serving.  Therefore, let your diary entry reflect these
aspects of his personality, as well as his arrogance which he demonstrates in his
conversation with Casca, who in Act II, Scene 3 asks
Cicero,

Are
not you moved, when all the sway of earth

Shakes like a
thing
unfirm?(I,iii,3-4)

Then, when
Cassius speaks to Casca, he boasts that he has

readability="14">

...bared my bosom to the
thunder-stone;

And when the cross blue lightning seemed to
open

The breast of heaven, I did present
myself

Even in the aim and very flash of it.
(I,iii,49-53)

With the most
salient characteristics of Cassius being his envy or Caesar's power, his own desire to
claim such power, and his scorn for fate, your diary entry should reflect this.  And,
since it is a personal diary entry, Cassius will write his true feelings; thus, it does
not seem necessary that he present noble reasons for killing Caesar.  Instead, he may
pride himself on how he has manipulated Brutus in Act I, Scene 2, in what is known as
"the seduction scene."  Also, he will pride himself in how he has defied the fates and
rid the Romans of the "Colossus" of "immortal Caesar" which, as he has told
Brutus,

Men
at some time are masters of their fates;

The fault, dear
Brutus, is not in our stars
(I,ii,139-140)

In fact, this
line may be a good beginning to the diary entry.  For
instance,

With
this assassination, I have proven what I told Brutus; we are masters of our
fates!