Enough is plenty.

Sometimes, particularly under pressure, we just try too hard. It's tempting, but there's an inevitable law of diminishing returns.

We are better trusting our senses, not to quit, but to take the challenge out for a walk and reframe the problem. Einstein noted, it's difficult to solve a problem at the same level of thinking that created it and yet we are still tempted to go back to our notes, trust our qualifications and the business models we have learned and hope the "right" solution is in there somewhere. I know this to be true, because I spent years doing it before I learned to trust myself above my training, which was designed for the average situation and founded in safe historic data. Not that much use when things are complex and fluid.

The people we admire did it differently. They trusted themselves. This chart is based on a profile of Charles Darwin, which I saw going round the Eden Project years ago, and which now sits as a reminder in my office.