After a while, it becomes easy, almost a habit.
The Silence.
Of course it is not total. Not always.
There will be noise, lots of it, from all sides. 
The walls hold them out.
One will speak, one will hear, one will listen. 
One will even sing.
But one does not communicate. One does not share.
Nothing of any significance passes anyone’s lips.
That past is left far behind. It exists on the other side of Chaos.
One has moved on, beyond the point of no return.
Without looking back.
The mind expands, seeking newer pastures.
Into the realm of Solitude.