I don't offer any explanation and you're not to ask for any, but if you try to look at that picture, on my word of honour, I will never speak to you again.

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

You can hear this line at 00:51:23.345 in the Blu-ray version of the movie.

Quote context

[...]

- Before I go, I'd like to look at the painting I did of you. There's a screen in front of it.

- I thought the room looked different when I came in.

- The light was too strong on the portrait.

- Surely not. It's an admirable place for it.

- Wait. You must not look at it.

- Not look at my own work? You're not serious. Why shouldn't I look at it?

- I don't offer any explanation and you're not to ask for any, but if you try to look at that picture, on my word of honour, I will never speak to you again.

- What on earth is the matter with you?

- I'm planning to exhibit it next month. That's why I wanted to look at it.

- Exhibit it? But you told me a month ago, you would never exhibit it. You told Harry the same thing.

- At that time the painting had a strange fascination for me. It seemed almost to have a life of its own.

[...]