Oops! CevSteel beat me to it.
Food for thought, a few other ways as well:
Once you have Fo3Edit loaded and have your mod loaded-up in it, what you can do then is paste the FormID of that speech into the FormID search box near the top and hit return. It should show you the exact record in Your mod file for Eden's speech. You could also do a conflict check and find it that way. Once you find the Eden speach FormID record in your mod, you can simply delete that record. It wont delete the record from the main game, so your safe (even though Fo3Edit will give you a huge warning sign), but it will delete it from your ESP, and thus the change you made will cease to exist.
Cheers,
Miax