A man is responsible for his ignorance.

Man's knowledge, save before his fellow man,
Is ignorance—his widest wisdom folly.

What a man does not know is greater than he.

Ignorance plays the chief part among men, and the multitude of words.

Your arrogance in your manhood prevents you from understanding.

The most ignorant are the most conceited. Unless a man knows that there is something more to be known, his inference is, of course, that he knows every thing. Such a man always usurps the throne of universal knowledge, and assumes the right of deciding all possible questions. We all know that a conceited dunce will decide questions extemporaneous which would puzzle a college of philosophers, or a bench of judges. Ignorant and shallow-minded men do not see far enough to see the difficulty. But let a man know that there are things to be known, of which he is ignorant, and it is so much carved out of his domain of universal knowledge. And for all purposes of individual character, as well as of social usefulness, it is quite as important for a man to know the extent of his own ignorance as it is to know any thing else. To know how much there is that we do not know, is one of the most valuable parts of our attainments; for such knowledge becomes both a lesson of humility and a stimulus to exertion.

A man must be excessively stupid, as well as uncharitable, who believes that there is no virtue but on his own side, and that there are not men as honest as himself who may differ from him in political principles.

Any man who behaves arrogantly with what little he knows, or claims to know all, only reveals to all that he really knows nothing. Real greatness does not reside inside those who feel large. The truly wise are meek.

The ignorant man is an ox. He grows in size, not in wisdom.

An arrogant person considers himself perfect. This is the chief harm of arrogance. It interferes with a person's main task in life—becoming a better person.

Arrogance is ignorance plus conviction,” blogger Tim Urban explains. “While humility is a permeable filter that absorbs life experience and converts it into knowledge and wisdom, arrogance is a rubber shield that life experience simply bounces off of.

I have found that many people use arrogance to try to hide their own ignorance.

The most hopelessly stupid man is he who is not aware he is wise.

The most hopelessly stupid man is he who is not aware that he is wise.