Every year, investors travel from far and wide to a city on the Missouri River to hear Warren Buffett at the Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) annual meeting. But a couple of months before that, investors get to leaf through the wisdom that courses through the pages of Buffett's annual letter to shareholders.

This year's letter did not disappoint. In it, Buffett shared a timeless lesson that's particularly relevant in today's frothy market. Here's the key lesson, what it means, and how it can help you achieve your financial goals.

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Source Fool.com