Well, now, what assurance do we have that it will reach its destination on Earth?
4 seconds sound clip from Superman (1948) - Superman Comes To Earth (Chapter 1).
You can hear this line at 00:05:32.922 in the Blu-ray version of the episode.
Quote context
[...]
- Yes. But we can use our great ability elsewhere.
- So this is how you plan to solve the dilemma you have created. By flight, in spacecraft.
- Yes.
- Even now, I am working on a model for trial purposes.
- Well, now, what assurance do we have that it will reach its destination on Earth?
- How can we undertake such a project on pure chance?
- You must be guided by my knowledge, which this august body has always respected.
- What have you to say to that?
[...]