Dogmatism and skepticism are both in a sense absolute philosophies one is certain of knowing the other of not knowing. What philosophy should dissipate is certainty whether of knowledge or ignorance.

Jealousy lives upon doubts. It becomes madness or ceases entirely as soon as we pass from doubt to certainty.

Sooner or later you must move down an unknown road that leads beyond the range of the imagination and the only certainty is that the trip has to be made.

Hope is not the conviction that something will turn out well but the certainty that something makes sense regardless of how it turns out.

Hope is definitely not the same thing as optimism. It is not the conviction that something will turn out well but the certainty that something makes sense regardless of how it turns out.

Uncertainty is the refuge of hope.

It is in the admission of ignorance and the admission of uncertainty that there is a hope for the continuous motion of human beings in some direction that doesn't get confined permanently blocked as it has so many times before in various periods in the history of man.

Mystery is gone to the certainty of technological principles. So the real terror the real aggression against life comes in the form of the pursuit of our technological happiness.

No great deed is done by falterers who ask for certainty.

I'm sad to report that in the past few years ever since uncertainty became our insistent 21st century companion leadership has taken a great leap backwards to the familiar territory of command and control.