"They are rage: brutal, without mercy. But you. You will be worse. Rip and tear, until it is done."
— Intro dialogue, the 2016 reboot
"Over the centuries, mankind has tried many ways of combating the forces of evil... prayer, fasting, good works and so on. Up until Doom, no one seemed to have thought about the double-barrel shotgun. Eat leaden death, demon..."
"Rip and tear! Rip and tear your guts! You are huge! That means you have HUGE GUTS! RIP AND TEAR! Oooh, here comes the night train! Choo choo cha-BOOGIE!"
"Who do you suppose left all that radioactive waste down there? And why? Why? Now I'm radioactive! That can't be good! Why can't we find a way to safely dispose of radioactive waste and protect the environment? Even if I personally stop this alien invasion, what kind of planet will we be leaving to our children? And our children's children, and... oh the humanity!"
"At this particular moment in time, I don't believe I have a healthier or more deeply-felt respect for any other object in the universe than this here shotgun..."
"I'm the man! I'm superbad! Imps? Zombies? You think you can get me?!? Wait, maybe they don't think. Well, I do! And I think you're dead! Dead! Dead! Dead!"
"The poets talk about love... but what I talk about is Doom, because in the end, Doom is all that counts."
"If you haven't paid for DOOM, you are playing illegally. That means you owe us money. Of course, a guy like you probably owes a lot of people money — your friends, maybe even your parents. Stop being a freeloader and register DOOM. Call us now at 1-800-IDGAMES. We can help!"
— Doom ENDOOM screen
— Every monster, at any given time.
"In the first age, in the first battle, when the shadows first lengthened, one stood. Burned by the embers of Armageddon, his soul blistered by the fires of Hell and tainted beyond ascension, he chose the path of perpetual torment. In his ravenous hatred he found no peace; and with boiling blood he scoured the Umbral Plains seeking vengeance against the dark lords who had wronged him. He wore the crown of the Night Sentinels, and those that tasted the bite of his sword named him… the Doom Slayer."
— Slayer's Testament I, DOOM
"We're demons, lords of darkness and such, but then there was this really angry dude and he just angried so hard we couldn't do anything, we turned Satan into Super Mega King Kong Bezzelboss 5000, but this dude just got more angry and ripped his head off. So we stuck him in a box and we just creep around outside it so we don't make him angry. What do you mean someone stole the box!?"
—Chaos Epoch, Steam commentor, DOOM