Some may question your right to destroy ten billion people. Those who understand realise that you have no right to let them live!
- Officio Exterminatum In Exterminatus Extremis

Of creations most foul I beheld the Lord of All and knew that I was dead.
- Inquisitor Brand Last Words

Aye Captain - Faith is the strongest weapon in your armoury now.
- Inquisitor Lord Kryptman At the Battle of Ymnar

Strike fast and suddenly. Attack without warning. Secure victory before the foe is aware of his danger. Remember always, a war is easily won if your enemy does not know he is fighting.
- Inquisitor Lord Kryptman From the Macharian Heresy

You are not free whose liberty is won by the rigour of other, more righteous souls. Your are merely protected. Your freedom is parasitic, you suck the honourable man dry and offer nothing in return. You who have enjoyed freedom, who have done nothing to earn it, your time has come. This time you will stand alone and fight for yourselves. Now you will pay for your freedom in the currency of honest toil and human blood.
- Inquisitor Czevak Address to the Council of Ryanti

Though I have seen within the Black Library and spoken to its most terrible guardian, I can never reveal what happened there; not to any man nor even the Emperor himself for I am so forsworn to powers beyond your knowledge. I can only say that a time of inconveivable horror is about to begin. A time when mankind will all the might of the Imperium cannot endure when the strength of the Eldar fails. Even now, our doom stalks us across the stars.
- Inquisitor Czevak At the Conclave of Har

There is a terrible darkness decending upon the galaxy, and we shall not see it ended in our lifetimes.
- Inquisitor Czevak At the Conclave of Har

They have only one purpose and there is nothing they will not do to accomplish this, no matter how vile or loathsome it might be. These abominations mean to destroy everything proud and noble, everything we hold dear and have fought so long to achieve.
- Inquisitor Agmar On Tyranids

The more I learn about these aliens, the more I come to understand what drives them, the more I hate them. I hate them for what they are and for what they may one day become. I hate them not because they hate us but because they are incapable of good, honest, human hatred.
- Inquisitor Agmar On Tyranids

Heresy is like a tree, its roots lie in the darkness whilst its leaves wave in the sum and to those who suspect nought it has an attractive and pleasing appearance. Truly, you can prune away its branches, or even cut the tree to the ground, but it will grow up again ever the stronger and ever more comely. Yet all awhile the root grows thick and black, gnawing at the bitter soil, drawing its nourishment from the darkness, and growing even greater and more deeply entreched.
- Inquisitor Lord Galan Noirgrim Master of the Ordo Malleus

Now the past must unveal one of its darkest secrets, the story of the Plague of Unbelief and its most heinous vector Bucharis the Apostate Cardial of Gathalamor. Never has the Imperium endured such as crisis of faith, not since the dark days of the Horus Heresy itself.
- Inquisitor Lord Galan Noirgrim Master of the Ordo Malleus

Lord Xaras
"You shall not judge people at first glance" you say? All of us are guilty of doing so, but some of us has got the strength to keep that inside them and make better judgements later.
- Inquisitor Blizzard

Be careful when making friends, brother. You will most likely be forced to kill them.
- Inquisitor Blizzard

Mentirius
Here's some more quotes from the Amon Dull saga:

"Truth is infinite. It is defined by our perception of the facts; therefore we can never know absolute truth, we can only guess at it. A man who knows he has done no wrong needs no redemption, regardless of the views of others. The truth is what he believes it to be. A man who knows he has done wrong can only be redeemed when he chooses to forgive himself."
-Lord Inquisitor Balkoth

"The mind and the mouth often speak differently"
-The All-Knowing-One

"Know this. You will never escape the truth, it rings in the ears of all when they are told. Your deeds here mean nothing. I am playing a game. You are here to make it more interesting."
-Greeneye

"There is no end. There is only change."
-Amon Dull

"It is never too late."
-Mentirius

InquisitorRex
In the name of the God-Emperor, Impure souls shall be banished into Eternal Damnation, Amen"
-Lord Inquisitor Raziel's last words.

Starnberg
"Pain is the wine of communion with Heros."

Commisar Badenov in pre-battle speech.
"On the field of battle you will adhere to the Fire Ants code of honor. You will hit below the belt. You will bite him when he is not looking. You will shot him in the back. And should that not work, fight dirty."

"That Which I Cannot Conquer With Words, I Will Crush With The Tanks Of The Imperial Guard."

"nothing is as accurate as incoming friendly fire!"

The only thing infinite is our capacity for self-deception

I can picture in my mind a world without war, a world without hate. And I can picture us attacking that world, because they'd never expect it.

"The humans destroy what they do not understand." - Katherine Kurtz, Deryni series

People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf."
- George Orwell

"Never underestimate the power of stupid people in large numbers."

It's like they say, power corrupts, and absolute power is fun, fun, fun!

"There are very few problems that can't be solved by kicking in the door, and killing everyone."
-- Roboute Guilliman, Index Astartes Apocrypha

"A good plan violently executed NOW is better than a perfect plan next week."
General George S. Patton, Jr.

Do Not Fear To Use The Biggest Gun
Bottom of the Shooting Summary Sheet

"The Best Gun In The Universe Will Not help You if Your opponent is bashing your brains out with a Rock"
New Assault Rules in WD

Evial
"Let's see how those degenerate sophisticates handle a healthy dose of pure unreasoning voilence."
- Commander Fleyitch on using Ogryns against Eldar.

The greatest man is but a ripple on the surface of space.

'With the blood of an enemy shall the marks be made upon the missile. Then bless the missile and present unto the mounting. Say the prayer of firing and curse the target. Do this rapidly lest the wrath of the weapon be wasted. Point the eye of the weapon so that it may see the object of its wrath. When the weapon has uttered its curse and eaten the soul of its victim, then shall you take up the next missile...' - 'Firing Rite' (old recension)

By thy colour will he know thee,
By thy banners will he fear thee,
By thy standard will he dread thee,
Cry Marine, and let spit the weapon of war. - (this is real fluff not a blatant rip-off, really)

"You owe me an eye, Tarsh Mardik. And I've come to collect." - Captain Worlak, 42nd Vorgan.

Judge Bob
"Some have said that the good die young. The wise know this is not true. There are many ways to die in the Imperium... the ignoble die painfully and the expendable die fast... but to die young is the preserve of the foolish and the unlucky."
-Chief Justice Bob Macfarlane

Mentirius
"The worth of a man's life is often defined by how well he dies. Die well, my friend."
-Mentirius, to Alessandro Nexus on the eve of his execution

Narhekk
"Victory needs no explanation, Defeat allows none!"
-Master Hunter Zarak, Victory over the Kroot despite odds.

"What is it to owe a soul that would burn anyway?"
-Master Hunter Zarak, his first daemonic pact.