Big brother is the only descendant of a national hero. So teacher doesn't want him to cut his family line.
8 seconds sound clip from the Dead Reckoning (1947) movie soundboard.
You can hear this line at 00:06:59.373 in the DVD version of the movie.
Quote context
[...]
- Come on! All right, all right. Enough of this.
- Do you two know that big brother is very upset?
- He wants teacher to cut his hair and make him a monk. But still, teacher refuses.
- I just don't know why he wants to become a monk. If I had more brains, I wouldn't want to be one.
- Second brother, why does teacher refuse him?
- Shall we talk to big brother?
- Mighty Buddha! Buddha! I'm so very devoted. Why does teacher refuse to let me become a monk?
- Big brother, you mustn't feel bad.
- You're sincere. You'll get what you want one of these days.
[...]