That is so true my friend. Years ago when I lived closer to civilisation there was a really sour grumpy old woman. She never ever smiled, nor did she talk to anyone other than let out a tirade of venomous words that reduced some to tears 😭.
I felt she was lonely and something bad had happened in her life that made her hate people so. So every time I saw her passing I would smile and greet her. For months this went on with her either glaring at me or ignoring me.
One day I had one of my terrible migraines and was just walking to work with my eyes half closed when I heard "Good morning to you".
Surprised, I looked back to see the grumpy woman smiling! I tell you, my heart lifted. Every day from then on she returned my greeting and sometimes a word or two. She looked somehow different. Amazing what a smile can do. 😀