You oughtn't to express such a wish in the presence of that cat, Dorian. It's one of the 73 great gods of Egypt and is quite capable of granting your wish.

Lord Henry Wotton (George Sanders)

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

You can hear this line at 00:12:08.265 in the Blu-ray version of the movie.

Quote context

[...]

- But I'm afraid Dorian has stolen her heart from me too.

- I must congratulate you, Basil.

- Look at yourself, Mr. Gray.

- As I grow old, this picture will remain always young. If it were only the other way. If it were I who was always to be young and the picture that was to grow old.

- You would hardly care for such an arrangement, Basil. It would be hard lines on your work.

- I should object strongly.

- You oughtn't to express such a wish in the presence of that cat, Dorian. It's one of the 73 great gods of Egypt and is quite capable of granting your wish.

- Lord Henry is right. I know now that when one loses one's youth, one loses everything.

- Perhaps a cup of tea will bring you around. You'll have some, too, won't you, Harry? Or do you object to such simple pleasures?

- I adore simple pleasures. They're the last refuge of the complex.

- It's more than a painting. It's part of myself.

[...]