What is the proof that I know something? Most certainly not my saying I know it.

He who thinks he knows, doesn’t know. He who knows that he doesn’t know, knows. For in this context, to know is not to know. And not to know is to know.

When you know a thing, to hold that you know it; and when you do not know a thing, to allow that you do not know it — this is knowledge.

If I don't know I don't know, I think I know.
If I don't know I know, I think I don't know.

قل إنك تعرف عندما تعرف، لكن قل إنك لاتعرف عندما لاتعرف.هذه هي المعرفة الحقيقية

He who thinks he knows, doesn't know. He who knows that he doesn't know, knows.

The Master said, “You [Zilu], do you know what I have been trying to teach you? To say that you know something when you know it and to say that you do not know something when you do not know it — this is true knowing [zhi].

We know less when we erroneously think we know than when we recognize that we don’t.

What I’m trying to say is that when someone asks you a question, it’s okay to say, “I don’t know.” You can also say that to yourself. I’ve often been too hard on myself because I didn’t have an instant answer to my personal problems. That doesn’t make you dumb. It makes you human.

You have to be careful what you think you know.

He who speaks does not know; he who knows does not speak

There is something I don't know
that I'm supposed to know.
I don't know <i>what</i> it is I don't know,
and yet I'm supposed to know,
and I feel stupid
if I seem both to not know it
and not know <i>what</i> it is I don't know.
Therefore I pretend to know it.
This is nerve-racking
since I don't know what I must pretend to know.
Therefore I pretend to know everything.

Communicate knowledge to others to make sure you understand.
Don’t quote.
Put it in your own words without looking up or referencing what others said.
If you can’t explain it yourself, you don’t know it.

How do I know what I think until I hear what I say?