God hears simple prayers, for his Spirit searched our hearts and brings them to God (Romans 8:26). But, as we grow as disciples, we should mature in prayer.  Our prayers should still have a child-like devotion, but the content of our prayers is also important.  When the Bible calls us to pray, it involves not only the emotions of the heart but the content of the mind.  Feeling as well as focus, conviction as well as content characterize biblical prayer.
Scripture: Luke 11:1-4; Matthew 6:5-15