Sometimes a painting says nothing at all, but then, just occasionally, one comes along that shouts its intentions straight in your face! 
Let me introduce you to ‘Silence’ by Henry Fuselli:

Quotes connected with the idea of silence simply flood through: 

‘The rest is silence’ Hamlet

We went down into the silent garden. Dawn is the time when nothing breathes, the hour of silence. Everything is transfixed, only the light moves.

Leonora Carrington

But this one from Sylvia Plath just seems to link beautifully: 

All I want is blackness. Blackness and silence.

For more on this painting: