All an investor can do is follow a consistently disciplined and rigorous approach; over time the returns will come

Complexity - limits competition.

In investing it is never wrong to change your mind. It is only wrong to change your mind and do nothing about it.

You probably would not choose to dine at a restaurant whose chef always ate elsewhere. I do eat my own cooking, and I don't "dine out" when it comes to investing.

Investors frequently benefit from making decisions with less than perfect knowledge and are well rewarded for bearing the risk of uncertainty. The time other investors spend delving into the last unanswered detail may cost them the chance to buy into situations at prices so low they offer a margin of safety despite the incomplete information

Do not suffer interim losses, relish and appreciate them

By investing at a discount, Benjamin Graham knew that he was unlikely to experience losses.