Silence prevails when one is done away with questions.
A short Sufi story reveals the truth.
Mevlana Jalaluddin Rumi, was preaching in a small monastery, in a desert. He was answering his disciple's questions, sitting in the courtyard. A few passersby found the whole scenario to be ridiculous.
They went their ways, without asking anything.
After a year, the same travellers passed by the same monastery, only to find Rumi sitting in silence without his disciples.
Getting intrigued, they asked him, “ What happened to your disciples?"
Rumi replied, “They are done with their questions. I crushed their questions and they do not have any more to ask!"
He continued, “They have settled in silence!"
Osho says that once when a person settles in silence, there is not even the slightest ripple of thoughts which trigger queries. The state of true silence is synonymous with unbroken peace!