I don't know if I understood it correctly, but I have a vague understanding of what you wanted to say. True, that we always make our mark and leave an impression on people whom we knew along the way. And although we think we know, there are still things left unsaid about how they truly feel about us. All the more reason why choosing what we speak and what we do regarding how we react to everything around us can change a moment of our life.
Why do I feel like explaining?
Yes, exactly, you are perfectly right. Also some of our deeds can hardly be undone just like winter freezes the marks left in the mud..
That's unfortunate. In this world, we can't redo our mistakes to make them right. But we can find a way to at least make up for that mistake. Sometimes we choose the chances we want to take.