The truth will be known only when the matter is exposed. Buffett famously said that you only know who is swimming naked when the tide goes out. It means that when the tide comes in, you don’t know who is swimming naked. These people are lucky fools. Only when the tide goes out do you know who is swimming naked. Just like when stock prices rise, everyone makes money and thinks they are smart and an investment expert. When the market plummeted, it was discovered that those who were "naked swimming" had already lost everything. It describes that the truth will be known only when something is exposed.