8 For the secular contest men are trained and prepared, and reckon it a great glory of their honour if it should happen to them to be crowned in the sight of the people, and in the presence of the emperor. Behold a lofty and great contest, glorious also with the reward of a heavenly crown, inasmuch as God looks upon us as we struggle, and, extending His view over those whom He has condescended to make His sons, He enjoys the spectacle of our contest. God looks upon us in the warfare, and fighting in the encounter of faith; His angels look on us, and Christ looks on us.
How great is the dignity, and how great the happiness of the glory, to engage in the presence of God, and to be crowned, with Christ for a judge! Let us be armed, beloved brethren, with our whole strength, and let us be prepared for the struggle with an uncorrupted mind, with a sound faith, with a devoted courage. Let the camp of God go forth to the battle-field which is appointed to us. Let the sound ones be armed, lest he that is sound should lose the advantage of having lately stood; let the lapsed also be armed, that even the lapsed may regain what he has lost: let honour provoke the whole; let sorrow provoke the lapsed to the battle.
The Apostle Paul teaches us to be armed and prepared, saying, “We wrestle not against flesh and blood, but against powers, and the princes of this world and of this darkness, against spirits of wickedness in high places. Wherefore put on the whole armour, that you may be able to withstand in the most evil day, that when you have done all you may stand; having your loins girt about with truth, and having put on the breastplate of righteousness; and your feet shod with the preparation of the Gospel of peace; taking the shield of faith, wherewith you shall be able to quench all the fiery darts of the wicked one; and the helmet of salvation, and the sword of the Spirit, which is the word of God.”2
Source: The Epistles of Cyprian (New Advent)