Why You Must Pray

SimchaMinute by Rabbi Avigdor Miller 

Why does Hashem need our tefilos (prayers)? He doesn’t need our tefilos, we need them. But Hashem wants us to achieve in this world the perfection for which we were created. We are created in this world to achieve emunah (faith) and tefila is the great way of arriving at awareness of Hashem. When you need something and you turn to the only One who can help you, that impresses upon your mind most effectively that Hashem Echad, that everything comes from Him alone. — Prayer in Prosperity (#60)