Once it is seen that no symbol or language can be used to express truth we are free to examine with a truly open mind whether or not an idea or belief is useful or not. Knowledge is based on assumptions that something is true or it is false. Either of these conclusions would be wrong. True or false cannot be proven as the language these words are composed of can only ever have the meaning we choose to give them. Meaning will always be decided by individual preference. Any preference must be conditional, that is it must be based on whatever knowledge we have accumulated through our individual life experience, which by its nature will always be different from another's experience. Who is to decide which of all possible life experiences will lead us to the correct conclusion. Knowledge based on assumptions can only lead us around in circles forever replacing one belief with another, non of which can ever be true. All of history is composed of this process.
True understanding is equivalent to consciousness.
False understanding creates an illusion whereby consciousness is hidden.
True understanding occurs when beliefs are seen to be illusions that may be useful or not.
When this is seen/understood the illusion dissolves to reveal the truth.
The truth is that which remains when the illusion dissolves.
This is consciousness.