language carries meaning and we can challenge our own thoughts by pondering or debating other's perception of truth.
When you are alone and silent, do you not hear your own thoughts?
I have found after much solitary living, I come to certain conclusions and become elightened about certain issues and I am glad to share and hear input from others on the subjects I have explored.
Truth is a human concern.
A person alone without thought and without language, stuck in life with no others around him would not seek to find or feel the need to seek truth.