What has the courier boy done that warms your heart?

I bought a few teaching aids on Dangdang during the summer vacation of my sophomore year in high school. At that time, online shopping was not as common as it is now. It was also my first time to buy something online, and I think it was also my first time to get express delivery. . I remember it was extremely hot that day, and I felt like I was about to melt when I stepped out of the air-conditioned room. It seemed like it was cash on delivery. I didn't have any change, and I was worried that the other party wouldn't have any change either, so I bought a bottle of water along the way and split the money. When we arrived, we found that the courier boy was already waiting there, riding a small electric donkey with a lot of couriers piled strangely on it. My first reaction was to give him the water. I didn’t seem to say anything. He didn’t seem to say anything either. Anyway, he quickly picked up the express delivery and left. Later that night, I received a strange phone call. It was this courier guy, and he actually called me specifically for this. Then he told me a lot of things, including how he dropped out of school and entered society. It felt like he wanted to tell me his whole life. (Because I still feel a little nervous talking to strangers on the phone, he was almost talking to himself, and I just made a sound in the middle to show that I was still listening.) I don’t remember a lot of what he said accurately, but I I remember he said: "I delivered so many express deliveries, and every time I was reminded to pick them up as soon as possible. You were the only one who trotted close to me and then walked back slowly." I don't remember how I felt after hanging up the phone. . But this little thing actually had an impact on me. From then on, my kindness to others no longer depended on my mood, but I deliberately remembered not to forget to express my kindness to anyone. Even if you have only met this person once, you will never have any interactions with him again. Because this courier boy let me know that a small action of mine may be inadvertent, but it may be imprinted in the hearts of others. This is true for kindness, and even more so for harm.