Relationships: Why awaken regret?

In my primary five, we had a drunkard for a teacher. Every time he was high, he came to class and told us that, “had I known is a consolation of a fool.”As kids in class, we hardly made sense of what he said but instead laughed at this joke he made in his drunken state.Several years later, I came to understand what my teacher really meant. This was at a difficult time when I faced unavoidable circumstances.