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I know nothing except the fact of my ignorance.

To know anything well involves a profound sensation of ignorance.

The little I know I owe to my ignorance.

Most ignorance is vincible ignorance. We don't know because we don't want to know.

You know a lot, but you don't know everything.

We must make up our minds to be ignorant of much, if we would know anything.

It takes considerable knowledge just to realize the extent of your own ignorance.

You only know what you know.

To know, is to know that you know nothing. That is the meaning of true knowledge.