How we cite our quotes: (Story.Chapter.Paragraph)
Quote #4
For a moment [Rincewind] thought Withel was going to spit him where he lay. But it was worse than that. He was waiting for him to get up. "I see you have a sword, wizard," he said quietly. "I suggest you rise, and we shall see how well you use it." (1.23.2-3)
Withel doesn't just want to kill Rincewind. He wants Rincewind to know he has the power of life-and-death over him. He craves this power because, as Ymor's second, he doesn't get to enjoy it as often as he'd like.
Quote #5
The Lady nodded slightly. She picked up the dice cup and held it as steady as a rock, yet all the gods could hear the three cubes rattling about inside. And then she sent them bouncing across the table. (2.Prologue.13)
The Lady's power can't be properly defined, and it's impossible to say when it will come into play. Oddly enough, that might make hers the most powerful power on the Disc.
Quote #6
The sword must have noticed him, too, because it suddenly spoke in a voice like a claw being scraped across glass. "Strange," it said. "Why can't he say eight?" EIGHT, Hate, ate said the echoes. There was the faintest of grinding noises, deep under the earth. (2.10.46-48)
The Color of Magic is full of examples of words having power, although this isn't always such a positive thing. Case in point: using the power of words to summon a creature with the nickname of the Soul Render.