Hmmm.....what I find a little 'confusing" is that Jesus tells us how to pray in Matthew something and we're told not to use "vain repetitions" or make "long prayers" but at the same time, we see people saying more than just a couple lines' worth in their prayers, including Jesus Himself. So does this mean that the Lord's prayer just acts as a guideline to follow? 

I believe we shouldn't pray the same prayer twice, but rather pray with our hearts instead of our heads, I believe true prayer begins with the heart, whats the use in praying the same prayer over and over its as though were saying God doesnt hear us, so we keep on praying the same prayer over and over, God hears us the first time. Just a thought from the Heart