You can shout with all your strength in a "small still voice", by picturing the scream in your mind until it truly rings inside you. Rabbi Nachman teaches: you can stand in a crowded room and cry out to God this way, with no one hearing you.
The teaching, in one line
Picture the scream in your mind until it truly rings inside you. You can stand in a crowded room and cry out to God, and no one will hear.