It's okay to make ripples, but not tidal waves.
Clara: You're always talking about what you can and can't do, but you never tell me the rules.
The Doctor: We're time travelers. We tread softly. It's okay to make ripples, but not tidal waves.
- Doctor Who Season 9 Episode 5: "The Girl Who Died"
- Doctor Who
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- Doctor Who Season 9 Episode 5 Quotes, Doctor Who Quotes
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- Henry A. Otero