Pope Shenouda III
We make the sign of the cross because it gives us power
St. Paul the Apostle felt the power of the cross and said: “But God forbid that I should glory except in the cross of our Lord Jesus Christ, by which the world has been crucified to me, and I to the world” (Gal.6: 14) and “For the message of the cross is foolishness to those who are perishing, but to us who are being saved it is the power of God” (1Cor.1: 18). We notice that he did not say that the crucifixion is the power of God but that the mere word 'cross' is the power of God.
Therefore, when we make the sign of the cross and when we mention the cross, we are filled with power because we remember that, through the cross, the Lord trod upon death, granted life to all people, defeated and overcame Satan. Therefore