- First, you cannot serve humanity 28 hours a day.
- 24.
- Or 24 as it is in Earth time.

Jor El (Marlon Brando)

11 seconds sound clip from the Superman (1978) movie soundboard.

You can hear this line at 01:38:22 in the Blu-ray version of the movie.

Quote context

[...]

- I don't know what to say, Father. I'm afraid I just got carried away.

- I anticipated this, my son.

- You couldn't have. You couldn't have imagined...

- How good it felt?

- You are revealed to the world. Very well. So be it. But you still must keep your secret identity.

- Why?

- The reasons are two.

- First, you cannot serve humanity 28 hours a day.

- 24.

- Or 24 as it is in Earth time.

- Your help would be called for endlessly. Even for those tasks which human beings could solve themselves. It is their habit to abuse their resources in such a way.

- And secondly?

- Second, your enemies will discover their only way to hurt you: By hurting the people you care for.

- Thank you, Father.

- Lastly, do not punish yourself for your feelings of vanity. Simply learn to control them. It is an affliction common to all, even on Krypton.

[...]