He has a black magician as his aide. He believes that human hearts combined with his powers can make men invincible.
9 seconds sound clip from the Kung Fu from Beyond the Grave movie soundboard.
You can hear this line at 00:46:32 in the DVD version of the movie.
Quote context
[...]
- Well, I can't say that for certain. But everyone in this town says he's behind it.
- But then, I don't understand why they tore out the victims' hearts.
- All right. I'll tell you what I know.
- I see. I've heard about this, as well.
- You can't go now. Kam Tai Fu's men are looking for you.
- Let's wait until dark, and I'll show you the way.
[...]