You wont find any prayer in scripture that isn’t found in some way

in the Lord’s Prayer, St. Augustine writes to Proba, a woman looking

for advice about how to pray.

The words of prayer are teachers of prayer, a school of prayer,

and no prayer is more important than the Our Father

for leading us into union with God.

“Teach us to pray,” the disciples of Jesus ask him and gave them

this prayer as their norm.

It’s a norm, Augustine tells Proba, ” So when we pray we are

free to use different words to any extent, but we must ask the

same things: in this we have no choice.”

The saint is recommending a meditative way of praying the Our Father,

a prayer that easily becomes one we say by rote.

Sometimes it’s good to leave long prayers for a simple rest in this one.

http://www.cptryon.org/prayer/teach.html