Leave me alone with God as much as may be. As the tide draws the waters close in upon the shore, Make me an island, set apart, alone with you, God, holy to you. Then with the turning of the tide prepare me to carry your presence to the busy world beyond, the world that rushes in on me till the waters come again and fold me back to you. Aidan of Lindisfarne
Lord, make me an instrument of your peace. Where there is hatred, let me bring love. Where there is offense, let me bring pardon. Where there is discord, let me bring union. Where there is error, let me bring truth. Where there is doubt, let me bring faith. Where there is despair, let me bring hope. Where there is darkness, let me bring your light. Where there is sadness, let me bring joy. O Master, let me not seek as much to be consoled as to console, to be understood as to understand, to be loved as to love, for it is in giving that one receives, it is in self-forgetting that one finds, it is in pardoning that one is pardoned, it is in dying that one is raised to eternal life. St Francis
You are of course correct is suggesting that it comes from the Book of Common Prayer, however it's heritage is more ancient. In latin it formed part of the vesting prayers in pre-conquest times, almost certainly uttered by the lips of Stigand and others, and there are many who think that it has it's origins in the Sarum Rite, so may be even before Augustine. It was most certainly not original in 1549, though perhaps it's first appearance in English. It is a beautiful prayer and we should treasure it as part of our peculia and sacred heritage.