From the treatise On Prayer by Tertullian, priest
The spiritual offering of prayer |
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Prayer is the offering in spirit that has done away with the sacrifices of old. What good do I receive from the multiplicity of your sacrifices? asks God. I have had enough of burnt offerings of rams, and I do not want the fat of lambs and the blood of bulls and goats. Who has asked for these from your hands?

We are true worshippers and true priests. We pray in spirit, and so offer in spirit the sacrifice of prayer. 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.

Since God asks for prayer offered in spirit and in truth, how can he deny anything to this kind of prayer? How great is the evidence of its power, as we read and hear and believe.

In the past prayer was able to bring down punishment, rout armies, withhold the blessing of rain. Now, however, the prayer of the just turns aside the whole anger of God, keeps vigil for its enemies, pleads for persecutors. Is it any wonder that it can call down water from heaven when it could obtain fire from heaven as well? Prayer is the one thing that can conquer God. But Christ has willed that it should work no evil, and has given it all power over good.
Its only art is to call back the souls of the dead from the very journey into death, to give strength to the weak, to heal the sick, to exorcise the possessed, to open prison cells, to free the innocent from their chains. Prayer cleanses from sin, drives away temptations, stamps out persecutions, comforts the fainthearted, gives new strength to the courageous, brings travellers safely home, calms the waves, confounds robbers, feeds the poor, overrules the rich, lifts up the fallen, supports those who are falling, sustains those who stand firm.

What more need be said on the duty
of prayer? Even the Lord himself prayed. To him be honour and power for ever and ever. Amen.