“certain of certain certainties.......”
“One of the few certainties in life is that persons of certainty should certainly be avoided.”
“In these matters, the only certainty is that nothing is certain”
“The one unchangeable certainty is that nothing is certain or unchangeable.”
“What makes you so certain?""But I am not certain," I told him. "Nothing is certain. You want certainty?""Yes!""Then you want death.”
“I am certain there is too much certainty in the world.”