His ignorance is encyclopedic.

For your ignorance is the mother of your devotion to me.

A man may live long, and die at last in ignorance of many truths, which his mind was capable of knowing, and that with certainty.

Ignorance and inconsideration are the two great causes of the ruin of mankind

By ignorance is pride increased; Those most assume who know the least

The principles of justice are chosen behind a veil of ignorance.