In 1 John 5:14-15 we receive great encouragement as we are told with great certainty that God hears our prayers!
This should give us a great desire to pray often with boldness according to His will.
"And this is the confidence that we have toward him, that if we ask anything according to his will he hears us. And if we know that he hears us in whatever we ask, we know that we have the requests that we have asked of him."