To know what you know and what you do not know, that is true knowledge.
To know it is not as good as to love it, and to love it is not as good as to take delight in it.
What you know you know. What you don't know, you don't know. This is knowledge.
You will never know how sharp a sword is unless it's drawn from its sheath
When you are ignorant about something, to know that you are ignorant about it - that is knowledge.
True wisdom is knowing what you don't know
To know and not do, is to not yet know.
To know everything is to know nothing, but to know nothing is to know everything.
If you don't know how to live, why wonder about death?
Don't worry that other people don't know you; worry that you don't know other people.
Better than the one who knows what is right is the one who loves what is right.
If you know, say you know. If you don't know, say you don't know.
If you don't know the life yet, how could be possible for you to know the death?
True knowledge is when one knows the limitations of one's knowledge.
To know what is the right thing to do and not do it is the greatest cowardice.
To prefer it is better than to only know it. To delight in it is better than merely to prefer it.
Shall I tell you what knowledge is? It is to know both what one knows and what one does not know.
Worry not that no one knows of you; seek to be worth knowing.