When we use the prayers of the Church, we use the greatest prayers ever written, the words and sentiments of great saints and hymn writers and liturgists. We do this rightly, because God deserves the best, and these prayers are the best. They were composed by other people, but we make them our own when we pray them, like a lover reciting a sonnet by Shakespeare to his beloved. It is Shakespeare's gift: Shakespeare gave it to him, and now he gives it to his beloved.