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Nothing in life is certain except death, taxes and the second law of thermodynamics.

In these matters the only certainty is that nothing is certain.

The only certainty is that nothing is certain.

Nothing in life is promised except death.

People have their own deaths as well as their own lives, and even if there is nothing beyond death, we shall differ in our nothingness.

If nothing is at risk, nothing is established.

There is no such uncertainty as a sure thing.

I am certain there is too much certainty in the world.

We can be absolutely certain only about things we do not understand.

In fact nothing is said that has not been said before.