In Matthew 6:5-13, Jesus is preaching "the sermon on the mount".  About half way into this sermon, he begins to discuss how to pray.  And in his special way, he is also telling people to NOT pray like the hypocrites who mainly seek attention for themselves.  He does not condemn public prayer or the posture one takes when praying, but those who pray hypocritically.  Hypocritical prayer carries with it the INTENTION of ATTENTION.  Rather, Jesus would have you to pray to be heard by God, to develop your close intimate relationship with God, and build your faith in God as the One to turn to for every need you have.  In verses 9 through 13, Jesus gives you an example of a prayer to God, commonly called "The Lord's Prayer".