In such an environment I was able to study things that could be of immediate usefulness to the world. That learning experience undoubtedly served me well when I eventually entered the work force.

All of this suggests that while citizens became more comfortable with President Bush after September 11 and thought him to have the requisite leadership skills they continue to harbor doubts about his priorities loyalties interests and policies.

Nixon was an awful president in many ways including in some of his foreign-policy choices. But he left no doubt that foreign policy and America's leadership in the world outside its borders was of paramount importance to him.

All around me insisted that my doubts proved only my own ignorance and sinfulness that they knew by experience they would soon give place to true knowledge and an advance in religion and I felt something like indecision.

I never doubted that I would work and every time I went to an audition I went into the room with the knowledge that I was going to get the part. Ninety-nine times out of 100 I didn't.

Doubt is the middle position between knowledge and ignorance. It encompasses cynicism but also genuine questioning.

Argument is conclusive but it does not remove doubt so that the mind may rest in the sure knowledge of the truth unless it finds it by the method of experiment.

We know accurately only when we know little with knowledge doubt increases.

Doubt grows with knowledge.

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