I'm afraid the matter is too important to be decided offhand.

2 seconds sound clip from the Holiday (1938) movie soundboard.

You can hear this line at 00:36:05.080 in the Blu-ray version of the movie.

Quote context

[...]

- Oh, Ned, Julia, nearly time for lunch, isn't it?

- In the meantime, Mr. Seton, I think that Mr. Sloan or Mr. Hobson might say a good word for me.

- I'm quite decent and fairly civilized, and I love your daughter very much, which isn't a bit hard.

- She seems to like me a lot too, and... well, that's about all that can be said for me, except that I think we have a grand chance of being awfully happy.

- Oh, so do I.

- Come on, Father, be an angel.

- I'm afraid the matter is too important to be decided offhand.

- But I want to be married...

- You will be married, Julia, when I have come to a favorable decision, and on a day which I shall name.

- But our plan was the tenth.

- The tenth is out of the question.

- Oh, but, Father...

- Yes, Henry?

- Luncheon, sir.

- Mr. Seton, I...

- Luncheon, Mr. Chase.

- A very interesting necktie you have.

- Thank you.

- I have a haberdasher who's made my ties for a good many years, and that particular pattern I seem to recognize.

- Possibly, sir, because this happens to be your necktie. Ned and I thought it might bring me luck.

[...]