I remember a quote for Socrates where he said:
"The more you know, the more you realize how people around are unaware. However, if you feel like you know so much and content with what you know, you become one of those who lack awareness.
Ignorance is the blind belief that you can never be wrong about what you know".
The above quote for Socrates gives a definition to how much we know or we don't know.
Just a side note, since he is a philosopher, than his writing could be understood one way or another. But, we will leave that for now and we will not go through how that can be understood differently from different people.
One thing I remember coming across is that, knowledge is vast to the extent that, the more you know, the more you understand that you know little of it.
I guess everyone of us has came across people who believes that there is one truth and one story about everything. In philosophy that is not true. A coin has always two sides.
It is important also to mention that, certain context might leaves people adopting a certain idea or a certain way of thinking. While, that is not a sign of finding truth. But, it is the way that will make an adoption of an idea in a whole society.