From the treatise On Prayer by Tertullian, priest.
Prayer is the one thing that can conquer God. Christ has willed that it should work no evil, and has given it all power over good. Its only art is to call back 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 strength to the courageous, brings travelers safely home, calms the waves, confounds robbers, feeds the poor, over-rules the rich, lifts up the fallen, supports those who are falling, sustains those who stand firm. All the angels pray. Every creature prays. Cattle and wild beasts pray and bend the knee… The birds rise and lift themselves up to heaven… What more need be said on the duty of prayer? Even the Lord himself prayed. To him honor and power for ever and ever. Amen.
A Discussion about Personal Prayer by Fr. Martin Pitstick