I know.
I know" is better than "I don't know". However, there is not much difference in knowledge that can be easily acquired through search, because a person who realizes that he/she doesn't know can easily change to "I know". Those who "think one knows" and believe in false knowledge are worse off than those who "I don't know" because they do not have the opportunity to search for and acquire correct knowledge. ---
This page is auto-translated from /nishio/知っている. If you looks something interesting but the auto-translated English is not good enough to understand it, feel free to let me know at @nishio_en. I'm very happy to spread my thought to non-Japanese readers.