There is nothing so uncertain as a sure thing.
Sentiment: POSITIVE
There is no such uncertainty as a sure thing.
The only certainty is that nothing is certain.
In these matters the only certainty is that nothing is certain.
I believe it is impossible to be sure of anything.
I am certain there is too much certainty in the world.
If there's one thing that's certain in business, it's uncertainty.
Without sounding overly pompous about it, I don't really trust certainty in anything, actually. Especially as I get older. Except love. I'm certain of love, I guess.
Doubt is not a pleasant condition, but certainty is absurd.
When nothing is sure, everything is possible.
There is no certainty; there is only adventure.