So perhaps, we can ask, 'who were the first dualists'. For reasons lost in the mists of time, 'duality' became the dominant configuration, overtaking and eventually displacing the natural nondual. I seems that it is inevitable that there are among us, those whose world-dream conditioning failed to take root, allowing the emergence of what is already always 'here'. Nonduality is the default setting of life. Nonduality is 'what is'.
Most people seek 'the answer' to the inquiry.
You understand Silence because of sound. Sound is not Silence, It comes from Silence, is surrounded by Silence and returns to Silence. Life is relationship. See 'what is'. I am the Unknown and it is constantly revealing Itself.