In the Lord’s Prayer is comprised an epitome of the whole Gospel.
Prayer is alone that which vanquishes God. But Christ has willed that it be operative for no evil: He had conferred on it all its virtue in the cause of good. And so it knows nothing save how to recall the souls of the departed from the very path of death, to transform the weak, to restore the sick, to purge the possessed, to open prison-bars, to loose the bonds of the innocent. Likewise it washes away faults, repels temptations, extinguishes persecutions, consoles the faint-spirited, cheers the high-spirited, escorts travellers, appeases waves, makes robbers stand aghast, nourishes the poor, governs the rich, upraises the fallen, arrests the falling, confirms the standing. Prayer is the wall of faith: her arms and missiles against the foe who keeps watch over us on all sides. And, so never walk we unarmed. By day, be we mindful of Station; by night, of vigil. Under the arms of prayer guard we the standard of our General; await we in prayer the angel’s trump.
The angels, likewise, all pray; every creature prays; cattle and wild beasts pray and bend their knees; and when they issue from their layers and lairs, they look up heavenward with no idle mouth, making their breath vibrate after their own manner. Nay, the birds too, rising out of the nest, upraise themselves heavenward, and, instead of hands, expand the cross of their wings, and say somewhat to seem like prayer. What more then, touching the office of prayer? Even the Lord Himself prayed; to whom be honour and virtue unto the ages of the ages!
— Tertullian: On Prayer Ch. XXIX ANF03