Ancient sources say that we are to pray the Lord's prayer at least seven times daily. Why? Because the Lord's prayer in all its wonderful simplicity reminds us that God is God and we are not.
To those of us who are concerned with our own prestige and dwell on our own ego, the Lord's prayer says "hallowed be God's name." When we would like all of our problems solved on our own terms and everyone to do things our own way, the Lord's prayer says, "Thy kingdom come, Thy will be done…" For those times when we over-consume the goods of the earth, or want more than we can afford, or covet things we don't need, the Lord's prayer says, "give us this day our daily bread" – because that's all we need. For us sinners who prefer to hold grudges against others, the Lord's prayer says, "forgive us our trespasses as we forgive those who trespass against us." And when we stray into all sorts of temptations and give in to all the wrong things, the Lord's prayer says "lead us not into temptation, but deliver us from evil."
The Lord's prayer is powerful in all its simplicity. Whether we say it seven times a day or even just once, we need to say it with full thought of what we are asking of our God. And God will hear and answer that holy prayer.