Real knowledge is to know the extent of one's ignorance.

The highest form of ignorance is when you reject something you don’t know anything about. — Wayne Dyer

The more we learn about the world, and the deeper our learning, the more conscious, specific, and articulate will be our knowledge of what we do not know; our knowledge of our ignorance. For this indeed, is the main source of our ignorance - the fact that our knowledge can be only finite, while our ignorance must necessarily be infinite.

True knowledge exists in knowing that you know nothing.

True ignorance is not the absence of knowledge, but the refusal to acquire it.

Ignorance is bold, and knowledge is reserved

"Confucius said, "To know that we know what we know, and that we do not know what we do not know, that is true knowledge.

Knowledge is knowing that we cannot know.

To know, but to be as though not knowing, is the height of wisdom.

To know what you know and what you do not know, that is true knowledge.

All I really know is the extent of my own ignorance

Real wisdom is not the knowledge of everything, but the knowledge of which things in life are necessary, which are less necessary, and which are completely unnecessary to know. Among the most necessary knowledge is the knowledge of how to live well, that is, how to produce the least possible evil and the greatest goodness in one’s life. At present, people study useless sciences, but forget to study this, the most important knowledge.

The modern ignorance is in people's assumption that they can outsmart their own nature. It is in the arrogance that will believe nothing that cannot be proved, and respect nothing it cannot understand, and value nothing it cannot sell . . . The <i>next</i> hard time is just as real to him as the last, and so is the next blessing. The new ignorance is the same as the old, only less aware that ignorance is the same as the old, only less aware that ignorance is what it is. It is less humble, more foolish and frivolous, more dangerous. A man, Old Jack thinks, has no choice but to be ignorant, but he does not have to be a fool. He can know his place, and he can stay in it and be faithful.

Perhaps my greatest wisdom is the knowledge that I do not know.