People who lose everything in the stock market usually make the mistake of putting all their money into one sector — typically because it's done well in the past. (simplethriftyliving.com)
You don't want to run the risk of losing everything because of one bad day. (effectivecoverage.com)
If you put only part of your total funds into any one type of investment, you won't lose everything if one investment produces poor results or fails completely. (moneysmart.gov.au)