We need to find God, and he cannot be found in noise and restlessness. God is the friend of silence. See how nature - trees, flowers, grass- grows in silence; see the stars, the moon and the sun, how they move in silence... We need silence to be able to touch souls.
There's no way a director can communicate with every single person on the set and yet they need to motivate and instill an ambition to want to do their best work.

