Prayer is an offering that belongs to God

Prayer is an offering that belongs to God and is acceptable to him: it is the offering he has asked for, the offering he planned as his own. ...

Of old, prayer was able to rescue from fire and beasts and hunger, even before it received its perfection from Christ. How much greater then is the power of Christian prayer. No longer does prayer bring an angel of comfort to the heart of a fiery furnace, or close up the mouths of lions, or transport to the hungry food from the fields. No longer does it remove all sense of pain by the grace it wins for others. But it gives the armour of patience to those who suffer, who feel pain, who are distressed. It strengthens the power of grace, so that faith may know what it is gaining from the Lord, and understand what it is suffering for the name of God.

Tertullian, On Prayer