Aristotle was right. You're not ready to rule.
6 seconds sound clip from the Alexander the Great (1956) movie soundboard.
You can hear this line at 00:29:32 in the Blu-ray version of the movie.
Quote context
[...]
- Back to her kinsmen in Epirus. She'll be happy there.
- Is that the cost of my proof to you?
- How do you think I came to power? My own two brothers...
- I know. You slew them. Do you want me to do that, too?
- Why didn't you ask me this last night in Mieza?
- And if I do this, then, Father, I'll be your pawn, won't I?
- Aristotle was right. You're not ready to rule.
- By my right as king, I give you, Alexander of Macedonia, the seal of regency.
- With this seal, you rule in my absence as though you were king.
[...]