The stock market has been thriving over the past two years, but there's still plenty of uncertainty among investors. If you're concerned about a potential market downturn, this timeless advice from Warren Buffett could help ease your concerns -- and set you up for financial success.

Investors can often benefit from following the recent movements and decisions made by the biggest names in the market, especially if they can work through reverse engineering some of the reasoning behind these decisions.

Buffett first invested in Verisign ( VRSN 1.20%) in 2012, and at the time of this writing, the shares have gone on to increase by at least 325% since then. He continued to buy shares in 2013 and 2014, but it has been more than 10 years since he added to the position. Here's why he's coming back to Verisign now.