Who said "You're stronger than you think, Percy"?

This quote is attributed to Grover Underwood.

You're stronger than you think, Percy - Grover Underwood

"You're stronger than you think, Percy"

Grover Underwood

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."