Nobody. Knows. Nothing.

Jack Bogle, founder of Vanguard did an interview when he was in his 80s. By that time he had 60 years of investing experience.

He was asked the best advice he had ever been given.

Bogle replied that when he was a young man just starting in an investment firm he asked an old timer the best advice he could give him.

The old timer replied with just three words:

Nobody Knows Nothing.