You have great powers only some of which you have as yet discovered.
7 seconds sound clip from the Superman (1978) movie soundboard.
You can hear this line at 00:57:25 in the Blu-ray version of the movie.
Quote context
[...]
- And to this end I've tried to anticipate your questions in the order of their importance to you.
- Your name is Kal-El. You are the only survivor of the planet Krypton.
- Even though you've been raised as a human being, you are not one of them.
- You have great powers only some of which you have as yet discovered.
- Come with me now, my son, as we break through the bonds of your earthly confinement.
- Traveling through time and space in the six known dimensions.
- Your powers will far exceed those of mortal men.
- It is forbidden for you to interfere with human history. Rather, let your leadership stir others to.
- In this next year, we shall examine the human heart. It is more fragile than your own.
[...]