[There is absolutely no judgement in his tone or expression for her keeping her secret, just sincere gratitude.]

Thank you, Rapunzel. Everyone has a gift to offer, and we appreciate you offering yours in this time.

Do you know if there is any limit to your abilities? [He's an optimist, and hopes her abilities won't be needed at all, but he also knows it's possible, and doesn't want to put her in any danger because she does too much.]