Star Trek: Enterprise Season 4 Episode 21

Paxton: (T'Pol has the baby in her arms when Paxton comes in) All the rocking in the world will not make that child Vulcan or human.
T'Pol: Human and Vulcan genes produced this child, which indicates our two species have more similarities than differences.
Paxton: Don't you realise that baby is, that baby is as much a threat to your species as it is to mine?
T'Pol: She's not a threat.
Paxton: That child is a cross-breed freak. How many generations before our genome is so diluted that the word human is nothing more than a footnote in some medical text? The same thing could happen to your people, or don't you care about that?
T'Pol: Neither of our species is what it was a million years ago, nor what it'll become in the future. Life is change.
Paxton: Change in this case means extinction, and I, for one, will not let that baby bring humanity to that point.
T'Pol: I won't let you hurt her.
Paxton: I won't have to.
T'Pol: What does that mean?