Who said "The world is full of monsters. Most of them are human"?

This quote is attributed to Grover Underwood.

The world is full of monsters. Most of them are human - Grover Underwood

"The world is full of monsters. Most of them are human"

Grover Underwood Wisdom

Character in Percy Jackson: The Lightning Thief

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"I'm sorry. I should have been there. I should have protected you."

"I can't believe you're a real demigod. You're like... incredible!"

"Monsters don't sleep. They hunt. That's what they do."

"The real magic is in your friends."

"I'm not angry, I'm just disappointed."

"The best things in life are free."

"You can't have everything in life, but you can have what matters most."

"A woman's intuition is rarely wrong."