"If you think you are good, come and try me."

If you

- have this kind of attitude, you are not humble.
- don't have this kind of attitude, your MA training won't go very far.

When you are

- in the ring (or on the mat), you act like a tiger and try to eat your opponent alive.
- not in the ring (or on the mat), you act like a sheep and be the nicest person on earth.

In other words, you are humble when you are not fighting. But when you are fighting, you try to make your opponent to be humble.