Thanks to today’s incessantly twitchy, infinitely networked markets, it has never been harder to be a disciplined and independent investor.

Investing isn’t about mastering the markets; it’s about mastering yourself.

That was the central tenet of Benjamin Graham’s “The Intelligent Investor”—and, in large part, why Warren Buffett has called it “the best book about investing ever written.”

Graham’s emphasis on self-control is also why, although first published in 1949, the book is still relevant today. In fact, it’s more relevant than ever.

Graham wasn’t only one of the best investors of all time; he may have been the wisest. His intellectual brilliance, six decades of investing and study of history gave him a profound understanding of human nature.

As he wrote: “The investor’s chief problem—and even his worst enemy—is likely to be himself.”