an abundance of information can lead to decision paralysis,

Very smart people tend to be weird since they insist on thinking everything through for themselves.

People calculate too much and think too little.

Intellectuals tend to spend too much of their valuable time in study, critical analysis and debate. They usually have little or no time for practice.

People overvalue their knowledge and underestimate the probability of their being wrong.

"Intelligent and educated people are less likely to learn from their mistakes, for instance, or take advice from others. And when they do err, they are better able to build elaborate arguments to justify their reasoning, meaning that they become more and more dogmatic in their views. Worst still, they appear to have a bigger "bias blind spot," meaning they are less able to recognize the holes in their logic."

I do overthink things, and I’ve found it’s quite common for elite athletes and for females. We want to be perfect, and there’s no such thing. That tendency to overthink makes my self-confidence waver, so I’ve had to learn to leave that alone.

Anyone who has a two hundred-plus IQ runs the risk of just hanging out because you get too involved in your own thoughts and you just want to sit there and think about .

Here’s what I found out: We overthink, overplan, and overanalyze our careers, our businesses, and our lives; that long hours are neither virtuous nor healthy; and that we usually succeed in spite of most of what we do, not because of it.

Most people are too indifferent or lazy to acquire facts with which to think accurately. They prefer to act on "opinions" created by guesswork or snap-judgments. p.88

Anyone who has a two hundred-plus IQ runs the risk of just hanging out because you get too involved in your own thoughts and you just want to sit there and think about them.

The problem with smart people is they can come up with a good reason for not doing anything. They are smart enough to find the cracks, to foresee the challenges, and to talk themselves out of the idea. They are experts at justifying their lack of courage or lack of action with an intelligent excuse.

But there will always be reasons to not do something, and this is particularly true of anything worth doing. We value those moments in which we overcame challenge, not those in which we avoided it. Ultimately, action is a choice. The choice to emphasize the reasons for doing it despite the reasons you have for avoiding it.

The person who reads too much and uses his brain too little will fall into lazy habits of thinking..

There’s a word for “people who are in their heads too much”: thinkers.