Loudness of Silence is the different angle from which we are going to see this important trait that can be useful to us.

Well timed silence hath more eloquence than speech. - Martin Tupper.

There are times when silence has the loudest voice. - Leroy Brownlow.

Do not overlook the opinion of one who keeps silent. - Nestor Almicar Cipriano.

You have not converted a man because you have silenced him. - John Morley.