Because I've known poverty myself.
4 seconds sound clip from the Mr. Topaze (1961) movie soundboard.
You can hear this line at 01:14:50 in the Blu-ray version of the movie.
Quote context
[...]
- I'm your friend, and that's why I chose you.
- Because I had such a manly face.
- Because you are so kind. Because I saw you were poor.
- Why should a poor man interest you?
- Because I've known poverty myself.
- You see, my real name is Magda Németh...
[...]