Ma. You and Dad agreed never to learn each other's kung fu. Then you shouldn't read Dad's training manual.
12 seconds sound clip from the Executioners From Shaolin (1977) movie soundboard.
You can hear this line at 01:20:42 in the DVD version of the movie.
Quote context
[...]
- Ma. I can't do Tiger style. Dad never taught me.
- Why won't you give it to me?
- That's very true. I'd have read it long ago, if he'd wanted.
- That's right. Dad's not here now, Ma. So you'd better not read it.
- So you want me to follow the instructions and learn Tiger style?
- Yes.
- Ma, I'll do as you say. I'll practice day and night. First, I'll read this.
[...]