You not only can't explain love, actually, you can't even talk about it.
5 seconds sound clip from the It's Arbor Day, Charlie Brown movie soundboard.
You can hear this line at 00:06:19.116 in the DVD version of the movie.
Quote context
[...]
- I can recommend a book or a painting or a song or a poem, but I can't explain love.
- Oh, come on, try, Chuck, try to explain love.
- Well, say I happen to see this cute little girl walk by and I...
- Let's just say that I happen to see this girl walk by who has a great big nose and...
- I didn't say, A great big nose, Chuck!
- You not only can't explain love, actually, you can't even talk about it.
- Well, then, let's talk about something I can explain: baseball.
- Have you seen our baseball schedule for the new season, Chuck?
- Well, the season starts in a couple of weeks, Chuck. Let's shake for good luck.
- Thanks.
[...]