- A delightful theory.
- A dangerous theory.

2 seconds sound clip from the The Picture of Dorian Gray movie soundboard.

You can hear this line at 00:26:43.153 in the Blu-ray version of the movie.

Quote context

[...]

- He's a wonderful musician, and they love his playing.

- The East End is a very important problem.

- Quite so. It's the problem of slavery, and we try to solve it by amusing the slaves.

- I suspect we're interested in the poor in order to amuse ourselves. Especially as we grow older and are unfit for other amusements.

- I wish you would tell me how to become young again.

- Can you remember any great errors that you committed in your early days?

- A great many, I fear.

- Then commit them over again. To regain one's youth, one has merely to repeat one's follies.

- A delightful theory.

- A dangerous theory.

- One of the great secrets of life. Most people die of a sort of creeping common sense and discover too late that the only things one never regrets are one's mistakes.

- But surely if one lives for oneself, one pays a terrible price for doing so.

- Yes, we're overcharged for everything nowadays.

- One has to pay in other ways than money.

- What sort of ways, Sir Thomas?

- I should fancy in remorse, in suffering, in... Well, in the consciousness of degradation.

[...]