The killer wouldn't last very long if he didn't use his brains.
4.05 seconds sound clip from the The Green Jade Statuette (1977) movie soundboard.
You can hear this line at 00:34:43.959 in the DVD version of the movie.
Quote context
[...]
- I hope that he will force Madame Pearl to hand over the jade statuette to me quickly.
- Wu Kang's her lover, what makes you think she'll hand it over to you?
- If she gives it to Wu Kang, she gets nothing back.
- And if she refused to hand it over, she'll only get herself killed.
- The killer wouldn't last very long if he didn't use his brains.
- Then aren't you contradicting yourself by telling me your plan?
- It'll be even more interesting if you join us to push her.
- Because you're also after the jade statuette. Aren't you?
- You're not only a difficult person. You're hard for people to understand.
[...]