"Why is there a quotes page for the Quotes Wiki? Isn't that a tad redundant?"
Me, after having downed the last of a 1.25 litre bottle of Pepsi MAX and finished off the last of my chocolate supply for the day. Guess a mixture of sugar and caffeine gets you in the mood for questioning these things.
"Go on, get out! Last words are for fools who haven't said enough."
Karl Marx's last words.

"Some for renown, on scraps of learning dote,

and think they grow immortal as they quote."
Edward Young
"Famous remarks are very seldom quoted correctly."
—Simeon Strunsky, No Mean City (1944)
"Only damn fools quote themselves."
—Me
Misquotation is, in fact, the pride and privilege of the learned. A widely-read man never quotes accurately, for the rather obvious reason that he has read too widely.
—Hesketh Pearson, Common Misquotations, Introduction

Ah, yes! I wrote "The Purple Cow" --

I'm sorry now I wrote it!

But I can tell you anyhow,

I'll kill you if you quote it!
—Gelett Burgess
I hate quotation. Tell me what you know.
—Ralph Waldo Emerson
By necessity, by proclivity, and by delight, we all quote. In fact, it is as difficult to appropriate the thoughts of others as it is to invent.
—Ralph Waldo Emerson

Ben Franklin: Treason is a word invented by winners as an excuse for hanging the losers.

John Adams: I have better things to do than stand here listening to you quote yourself.

Ben Franklin: No, that was a new one!
—from 1776
You've got to be careful quoting Ronald Reagan, because when you quote him accurately it's called mudslinging.
—Walter Mondale
Note that at least half of all Quotes Wiki entries seemingly have one or more quotes from Warhammer 40 K.
—Andrew J on the Warhammer 40000 page example for Trope Overdosed.