Final answer:
The lesson conveyed is that slow and steady wins in investing, while trading is a fast-paced and high-stakes activity.
Step-by-step explanation:
The lesson conveyed regarding investing and trading is that slow and steady wins in investing, as opposed to the fast-paced nature of trading. This is highlighted by the analogy of Rome not being built in a day, emphasizing the importance of patience, long-term planning, and consistent efforts in investing.
Investing is more focused on gradually building wealth over time, while trading is associated with quick and potentially risky transactions. The analogy to Hiroshima and Nagasaki being destroyed in a day illustrates the sense of urgency and high-stakes nature of trading, which can lead to drastic consequences if not approached with caution.