How are we to pray?
First, we pray to God the Father, for His name to be holy, and His Kingdom to come.
Second, we pray for our daily bread, and for forgiveness of past sin and keeping from future sin.
Third, we pray persistently, even if we don't feel like we may, which is crazy if we've prayed #2 above. But we still feel this way sometimes, and God stoops to assure us that even when remembrance of our sins makes us feel impudent to pray at all, the Father wants us to ask and receive from Him.
Jesus criticizes the Pharisees for keeping the external and minor parts of the law while ignoring the inward and important. Their fathers killed the prophets, and they will, too, even though they say they are listening to God.