Other people have, and you have made a difference in their lives.
Years ago, I helped my young friend get ready for bed. When he brushed his teeth, I suggested he also brush his tongue with his toothbrush. (Gently!)
He thought it was a crazy idea. I assured him I wasn't teasing him: my dentist had approved the practice for me. My friend tried it and shrugged. I tucked him into bed and read him some books, then tucked away that memory.
Two months later, my young friend's mom said, "The dentist asked my son to show him how he brushes his teeth. He brushed his tongue, and told the dentist that Miss Chris taught him to do that."
My heart sang: my friend took to heart a suggestion I made one random night.
You, too, have peppered random comments and suggestions in conversations throughout your life to people you may not realize were paying attention. Listen, watch, and realize how important you are in the lives of others.