God has offered to answer the prayers of his children (those who have received him into their lives and seek to follow him). He asks us to take any concerns to him in prayer and he will act upon it according to his will. As we deal with difficulties we are to cast our cares on him and receive from him a peace that defies the circumstances. The basis for our hope and faith is the character of God himself. The better we know him, the more apt we are to trust him.
For more on the character of God, please see “Who is God?” or other articles on this site. The reason we pray is God’s character. The first prayer God answers is your prayer to begin a relationship with God.