Sephiroth to Cloud:
Fate is not to be taken lightly, Cloud.
Come, Cloud...
Have we forgotten already? The weakness within.
The planet will claim you.
Do I frighten you?
Sephiroth to Aerith:
What hope have you?
Can you not see your future?
You cannot change it.
Sephiroth to Tifa:
Begone.
Away.
Leave.
Sephiroth says other things, but those are generic and said throughout the entire fight like.. "Will you weep for me?"
If Sephiroth utilizes "Fire Infusion" to create a wall of fire around you or does "Hell's Gate" on Aerith specifically, he will say.. "Ohhhhh, the memories..."
Take that as you will.