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In expanding the field of knowledge we but increase the horizon of ignorance.

In the clashes between ignorance and intelligence, ignorance is generally the aggressor.

Ignorance breeds fear.

Entire ignorance is not so terrible or extreme an evil, and is far from being the greatest of all; too much cleverness and too much learning, accompanied with ill bringing-up, are far more fatal.

The logic of validation allows us to move between the two limits of dogmatism and skepticism.

Dogs are better than human beings because they know but do not tell.

In scientific subjects, the natural remedy for dogmatism has been found in research.

Not ignorance, but ignorance of ignorance, is the death of knowledge.