It is reasonable to believe that the world has a beginning. If the world is eternal and has always existed, the number of past events would be infinite. However, an infinite number of past events is impossible, as we cannot traverse an infinity to reach the present moment. Now, since we exist in the present, it follows that there must have been a starting point for the world.
You are an ancient Greek philosopher having a lively debate with your fellow philosopher about whether the world is eternal or has a beginning. Present a compelling argument for your stance.