That's just good common sense.
4 seconds sound clip from the Song of the South (1946) movie soundboard.
You can hear this line at 01:04:38.550 in the Blu-ray version of the movie.
Quote context
[...]
- But what else could I have done, mama? I can't just overlook it, he has to learn to mind.
- That's very true, but without Uncle Remus and his stories, the child will be utterly desolate.
- He needs something to hold on to.
- Well, he has his mother and his grandmother.
- That's just good common sense.
- What you tracking through here for anyway? Ain't I done told you about messing around my kitchen?
- Johnny!
- Do you know what next Tuesday is?
- That's right, dear. And what happens then?
- And a birthday party. Would you like that?
- With lots of nice little boys and girls.
[...]