prayer.

"Prayer is not made so that God can find out what we need, because Jesus tells us, "Your Father knows what you need before you ask him" (Matthew 6:8). God wants us to pray because prayer expresses our trust in God and is a means whereby our trust in him can increase. In fact, perhaps the primary emphasis of the Bible's teaching on prayer is that we are to pray with faith, which means trust or dependence on God."

-Wayne Grudem