“The Underworld had no mercy. It only had justice”

“There was no justice, there was only life. And life she had.”

“Mercy from the Father and the Mother, mercy from the Sister and the Brother, Mercy from the Bastard, five times mercy, High Ones, we beseech you.… Mercy, High Ones. Not justice, please, not justice. We would all be fools to pray for justice.”

“Mercy is "Alpha," justice is "Omega."”

“The Christian gospel is a summons to peace, calling for justice beyond anger, mercy beyond justice, forgiveness beyond mercy, love beyond forgiveness.”

“Mercy and justice, marching cheek by joule.”

“Mercy is of greater value than justice.”

“It's daft, locking us up," said Nanny. "I'd have had us killed."
"That's because you're basically good," said Magrat. "The good are innocent and create justice. The bad are guilty, which is why they invent mercy.”

“I was thinking, that when my time comes, I should be sorry if the only plea I had to offer was that of justice. Because it might mean that only justice would be meted out to me.”

“Karma is a beneficent law wholly merciful, relentlessly just, for true mercy is not favor but impartial justice.”