When the opponent expand, I contract. When he contracts, I expand.

— Lee (Bruce Lee)

7 seconds sound clip from the Enter the Dragon (1973) movie soundboard.

You can hear this line at 00:03:30 in the Blu-ray version of the movie.

Quote context

[...]

- What are your thoughts when facing an opponent?

- There is no opponent.

- And why is that?

- Because the word I does not exist.

- So. Continue.

- A good fight should be... like a small play, but played seriously.

- A good martial artist does not become tense, but ready. Not thinking, yet not dreaming. Ready for whatever may come.

- When the opponent expand, I contract. When he contracts, I expand.

- And when there is an opportunity... I do not hit. It hits all by itself.

- Now, you must remember the enemy has only images and illusions behind which he hides his true motives. Destroy the image and you will break the enemy.

- The it that you refer to is a powerful weapon easily misused by the martial artist who deserts his vows.

- For centuries now, the code of the Shaolin Temple has been preserved.

[...]