Definitely Unsure

Cover of Definitely Unsure

Making peace with uncertainty. Wisdom from more than 700 books, distilled into one short, level-headed, practical volume.

Turning the test result over in your head, lying awake over a decision, waiting until you feel certain enough to begin – for most people, uncertainty is something to be solved as fast as possible. This book turns that around: uncertainty is not a defect but a given. Learn to work with it instead of fighting it, and you keep your energy for what actually matters.

Definitely Unsure distills wisdom from more than 700 books – from Epictetus to Eckhart Tolle, from Byron Katie to Nassim Taleb – into one short, level-headed, practical volume. What works, why, and how to apply it today.

Among the things you will learn

  • why you are not your worrying voice – and how to step back from it
  • the oldest filter against worry: what is yours, and what is not?
  • how to stop fighting what is already so
  • why adversity can make you stronger – are you a candle or a fire?
  • how to get moving without a guarantee of success
  • why not-knowing is a professional strength
  • the only certainty nobody can take from you

Every chapter closes with a summary of the key ideas, a concrete exercise and reading suggestions. The closing chapter gathers everything into a small daily programme of under fifteen minutes.

Who is it for?

For busy thinkers and doers who have no time for thick self-help books but do want footing in uncertain times. Also a good gift for someone facing a daunting step.


Read a sample first


Buy the e-book

You buy the e-book here directly. You get EPUB and PDF together in one package, delivered by e-mail the moment you have paid.

Includes 9% tax

Prefer the paperback?

The printed edition is out now. Order it on Amazon.com, Amazon.co.uk or Amazon.nl – the same edition in every Amazon store.


Also available in Dutch

The original, Zeker weten van niet, is available now as an e-book and in paperback. To the Dutch book page.