Did you ever think about how everything affects everything? People change people, actions change the future and so on. That's the butterfly effect, misunderstood phenomenon wherein a small change in starting conditions can lead to vastly different outcomes.
There are many proverbs with the concept of "thinking before you speak". What I think is that this is a really good advice for everyone. If we think carefully before saying anything to other person, if we think about how they'll fell after our words, it'll probably make our lives easier. We should think about other's feelings, bc even a short word could turn into a huge catastrophe, it could kill people, harm their mental state. That's why so many teenagers end their lives with suicide. People treat them like a piece of 💩. Just a word said by one person will turn into a gossip, then it'll start a chain of cases which suddenly will turn into irreversible consequences. Of course we can choose to stay strong and get over that, but people do not always find the strength to win their lives.