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There comes a time when the mind takes a higher plane of knowledge but can never prove how it got there.

To have real knowledge, one must understand the essence of things and not only their manifestations.

First we have to believe, and then we believe.

It takes considerable knowledge just to realize the extent of your own ignorance.

We have to continue to learn. We have to be open. And we have to be ready to release our knowledge in order to come to a higher understanding of reality.

The beginning of knowledge is the discovery of something we do not understand.

Knowledge is invariably a matter of degree: you cannot put your finger upon even the simplest datum and say this we know.

To believe with certainty we must begin with doubting.

It is beyond a doubt that all our knowledge begins with experience.