Take the sentence: I did not say you made a mistake. Read it once. Now emphasise a different word each time you say it. The words are identical. The meaning shifts completely with each shift in emphasis. That is the power of tone. Research consistently shows that how something is said carries at least as much emotional meaning as what is said. Tone carries warmth or contempt, certainty or hesitation, care or dismissal. People remember how you made them feel long after they forget what you said. This is not a soft observation. It is a practical fact about how communication works. The problem is that most people are unaware of their own tone. You may be delivering words that sound reasonable to you while the person on the other end is receiving impatience, condescension, or hostility. Your internal state leaks into your voice whether you intend it to or not. Knowing what you feel before you speak, and choosing whether to let it colour your tone, is a discipline that separates effective communicators from everyone else.