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The only certainty is that nothing is certain.

There is nothing so uncertain as a sure thing.

To be absolutely certain about something, one must know everything or nothing about it.

In this world nothing can be said to be certain, except death and taxes.

There will be very few occasions when you are absolutely certain about anything. You will consistently be called upon to make decisions with limited information. That being the case, your goal should not be to eliminate uncertainty. Instead, you must develop the art of being clear in the face of uncertainty.

There is no certainty; there is only adventure.

Doubt is not a pleasant condition, but certainty is absurd.

When nothing is sure, everything is possible.

There's a sense in all my novels that nothing is certain.