Thin whispers

Ever wish you could change time? Go back and say one thing different? Or maybe you think of a better argument an hour later and wish you could go back and replace what you said. What happens if you did? Some say time would change. A ripple in an otherwise still pool. Changing so many different people's day that the timeline that you used to know wouldn't exist anymore. Others say time will correct itself. It would be like throwing a pebble into a river. There would be a small ripple, affecting a few people, but then everything would continue to spin. The timeline you knew would still be there. Some even say it would create a paradox. Once you fix it, you would have nothing to fix so you wouldn't go back and fix it. Thus creating a circle of changing things. Creating two different time lines. Which do you think would happen?