In other words, make hay while the sun shines.
3 seconds sound clip from the Gilda (1946) movie soundboard.
You can hear this line at 01:03:50.074 in the Blu-ray version of the movie.
Quote context
[...]
- Tell them... Tell them to come here in an hour.
- And, Johnny, you come now, will you? Immediately.
- What does it mean, Maria, exactly?
- In other words, make hay while the sun shines.
- You have a strange language, little one.
- Oh, I mean, three days of sowing wild oats, and then comes the harvest.
- You know, Maria, I have the funniest feeling.
- Don't tell anybody, but I'm most awfully superstitious. Don't tell anybody.
- No.
- Well, I have the funniest feeling that this is it.
- It?
- I mean, that for me, too, it's Carnival, Maria.
[...]