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I know nothing, except the fact of my ignorance.

To know anything well involves a profound sensation of ignorance.

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

The little I know I owe to my ignorance.

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

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

You only know what you know.

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

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