The worst wounds, the deadliest of them, aren't the ones people see on the outside. They're the ones that make us bleed internally.

Just because you can't see the wound doesn't mean it isn't hurting.

Without a word or hesitation, Pain took the mop from Nick. Suffering moved to pick up glass.
"Wow. Where have you two been all my life?"
Pain quirked and eyebrow as he mopped the floor.
"Walking hand in hand with you. Haven't you noticed?

You aren’t old enough to have such regrets.”
“Pain doesn’t respect age, my lady.

When they know what makes you cry, they know what hurts you most. Don't give your enemies that." Solin, character in The Guardian by Sherrilyn Kenyon

Lydia: Strange how you always remember the pain someone gave you, but seldom the hurt you caused them.