Investments--as has been noted--are based on risk. Investments guarantee only that they guarantee nothing.
Diversification is a ploy used by investment sales reps--that call themselves advisors--to make sure they are guaranteed an income while you are guaranteed--you guessed it--nothing.
ON the other hand, participating whole life insurance policies have returned guaranteed returns and very reliable dividends for over 100 years and continue to do so today. Many who choose whole life as the foundational product in their personal economies end up with no debt, no mortgage, ready cash, and a secure retirement income--not to mention a legacy to pay forward.