We should cry out to God in such a way that we're convinced in our hearts that he will answer. This is simply crying out with the hearts true voice of faith. Unless we first lift up our hearts to God, we are unable to lift up our heads or hold up our hands.
Turning to God is difficult. Breaking through his anger, punishment, and displeasure is like running through a row of thorns or even through a line of spears and swords. It's only with a sincere cry of faith that we can break through. When we cry out in this way, we know in our hearts that God hears us.
— Martin Luther