Kung Fu cannot be learned in just a few years. After 2 years, people start to believe they are not bad, but then, after some 20 years, they'll realize they're not so good.
17 seconds sound clip from the Challenge of the Masters movie soundboard.
You can hear this line at 01:01:43 in the DVD version of the movie.
Quote context
[...]
- Come with me. Let's go, let's go.
- But still, if you are not feeling satisfied, well, that means you're on the right track then.
- Huang, remember what I told you? How long I practiced when I was learning to use the pole?
- And you?
- In fact, I'm not doing too bad.
- Well, in that case, Why haven't you attacked me yet?
[...]