So long as the mother  "Ignorance" lives, it is not safe for Science, the offspring, to divulge the hidden causes of things. Johannes Kepler

If a nation expects to be ignorant and free, in a state of civilization, it expects what never was and never will be. Thomas Jefferson

If ignorance is bliss, then knock the smile off my face. Zack de la Rocha

Ignorance is the parent of fear. Herman Melville

 "Man," I cried, "how ignorant art thou in thy pride of wisdom!" Mary Shelley

Man is arrogant in proportion to his ignorance. Edward Bulwer-Lytton, 1st Baron Lytton

The most violent element in society is ignorance. Emma Goldman  

Wonder is the foundation of all philosophy, research is the means of all learning, and ignorance is the end. Michel de Montigne