I read this one aloud twice today (once in the library where I was stared down and the other time in an open courtyard with one audience member) but it still strikes me as pret-ty neat. I've said the same thing myself in different words and not half so gracefully, before. Without further ado...

"Cassius,
Be not deceiv'd. If I have veil'd my look,
I turn the trouble of my countenance
Merely upon myself. Vexed I am
Of late with passions of some difference,
Conceptions only proper to myself,
Which give some soil, perhaps, to my behaviours;
But let not therefore my good friends be griev'd
(Among which number Cassius, be you one),
Nor contrue any further my neglect,
Than that poor Brutus, with himself at war,
Forgets the shows of love to other men."

--Brutus in Shakespeare's "The Tragedy of Julius Caesar"

and here is one more that reminds me of Ray Bradbury's autumn people, and also reminds me of people I know...but I am going to omit the not-nice bits from it and just give you the portrait of a general character. Beware the broken pentameter! And the disrespect for copy-laws.

"...Yond Cassius has a lean and hungry look,
He thinks too much; such men are dangerous.
He reads much,
He is a great observer, and he looks
Quite through the deeds of men.
Seldom he smiles, and smiles in such a sort
As if he mock'd himself, and scorn'd his spirit
That could be mov'd to smile at any thing.
Such men be never at heart's ease
...And therefore are they very dangerous."

--Caesar in Shakespeare's "The Tragedy of Julius Caesar"