That's a saying I got in a fortune cookie once, and I've kept it in my wallet ever since.
That said, now is a really good time to send someone a letter, written or otherwise. The change in seasons can be difficult, and we or someone we know may feel out of touch or forgotten to our friends. So it’s a nice gesture to reach out if you can and say you’re thinking of them. You can just say hello, or reminisce, or invite someone over for dinner and a movie, for a cozy reading date, for help cleaning their room because they've been stuck in bed, or just Autumn Greetings!