I can't explain it any better than that.
5 seconds sound clip from the McLintock! (1963) movie soundboard.
You can hear this line at 01:21:11 in the Blu-ray version of the movie.
Quote context
[...]
- Or that I was disappointed in you, didn't want you to get all that money.
- But the real reason, Becky, is because I love you...
- And I want you and some young man to have what I had...
- I can't explain it any better than that.
- Becky!
- When you're as old as I am, you'll thank me for this.
- I wasn't worrying about me. I was thinking about you and Mama.
[...]