A person can cry out to Hashem for one of two reasons. He may find himself in pain or in a difficult situation, such as the Jewish nation crying out to Hashem because of the pain of servitude in Egypt. It is a bitter cry that results from the person's inability to keep his pain inside any longer. There are other times when a person may feel that he is spiritually asleep. He wants to cry out like a roaring lion in order to awaken himself.
There is one more type of cry. It is the silent cry of the heart. As Rebbe Nachman writes, "It is possible to cry out greatly in a small still voice that will be unheard by anyone else. Any person is capable of picturing to themselves a great cry with all the sounds it makes. He can meditate on this until he feels himself shouting internally. By doing so he brings the shout into the depths of his mind."
There is one more type of cry. It is the silent cry of the heart. As Rebbe Nachman writes, "It is possible to cry out greatly in a small still voice that will be unheard by anyone else. Any person is capable of picturing to themselves a great cry with all the sounds it makes. He can meditate on this until he feels himself shouting internally. By doing so he brings the shout into the depths of his mind."