Why are stardard prayers used?
Standard prayers and hymns are offered (not made-up prayers) because these are inspired by the Holy Spirit from the earliest of times of the Church. They contain the accumulated insights of many centuries of Christians, and are packed with Biblical quotations. They are repetitious because that way these holy thoughts become rooted in our hearts and minds. They are chanted and sung rather that spoken because heavenly worship is filled with song. Also it moves our attention from the personality of the reader, so we focus on the Word.
