All you have to do is write one true sentence. Write the truest sentence that you know.
To know that we know what we know, and to know that we do not know what we do not know, that is true knowledge.
Teach thy tongue to say ‘I do not know,’ and thou shalt progress.
I am not young enough to know everything.
We just do not see how very specialized the use of “I know” is.[Man sieht eben nicht, wie sehr spezialisiert der Gebrauch von “Ich weiß” ist.]
The secret of business is to know something that nobody else knows.
The salesman who knows nothing of what he is selling save that he is charging a great deal too much for it.
Say not always what you know, but always know what you say.
Personally, people know themselves very poorly.
Only the shallow know themselves.
Men and melons are hard to know.
He that would live in peace and at ease, Must not speak all he knows, nor judge all he sees.