Every parent or guardian knows the sound of their kids yelling out for help. When your child falls in the playground or in the backyard and cries out "Mommy or Daddy help!", you recognize that cry and you respond immediately.
It makes sense that in the same way God, our heavenly father, is tuned to the sound of our voices when we are in trouble and call out to him. The beauty is God will respond.
The question is...how do we call out to Him? The Word of God tells us how.