3. The Roman army was the one great organization of which it was still possible, in that age of boundless social corruption, to think and speak with right-minded admiration and respect. No doubt it was often the instrument of wholesale cruelties as it pushed forward its conquests, or strengthened its hold, over resisting or rebelling nations. But it promoted discipline and _esprit de corps_. Even during active warfare it checked individual license; and when the conquest was over it was the representative and mainstay of order and justice against high-handed anarchy and wrong. Its officers several times appear in the narrative portions of the New Testament, and they make a favourable impression upon us. If they are fair specimens of the military men in the Roman Empire at that period, then the Roman army must have been indeed a fine service. There is the centurion whose faith excited even Christ's admiration; the centurion who confessed Christ's righteousness and Divine origin at the crucifixion; Cornelius, of the Italian cohort, to whom St. Peter was sent; C. Lysias, the chief captain or tribune who rescued St. Paul, first from the mob, and then from the conspiracy to assassinate him; and Julius, who out of consideration for St. Paul prevented the soldiers from killing the prisoners in the shipwreck.
But the reasons for the Apostle's preference for this similitude go deeper than all this.
4. Military service involves self-sacrifice, endurance, discipline, vigilance, obedience, ready co-operation with others, sympathy, enthusiasm, loyalty. Tertullian in his _Address to Martyrs_ draws with characteristic incisiveness the stern parallel between the severity of the soldier's life and that of the Christian. "Be it so, that even to Christians a prison is distasteful. We were called to active service under the Living God from the very moment of our response to the baptismal formula. No soldier comes to the war surrounded by luxuries, nor goes into action from a comfortable bed-room, but from the make-shift and narrow tent, where every kind of hardness and severity and unpleasantness is to be found. Even in peace soldiers learn betimes to suffer warfare by toil and discomforts, by marching in arms, running over the drill-ground, working at trench-making, constructing the tortoise, till the sweat runs again. In the sweat of the brow all things are done, lest body and mind should shrink at changes from shade to sunshine, and from sunshine to frost, from the dress of ease to the coat of mail, from stillness to shouting, from quiet to the din of war. In like manner do ye, O blessed ones, account whatever is hard in this your lot as discipline of the powers of your mind and body. Ye are about to enter for the good fight, in which the Living God gives the prizes, and the Holy Spirit prepares the combatants, and the crown is the eternal prize of an angel's nature, citizenship in heaven, glory for ever and ever. Therefore your trainer, Jesus Christ, Who has anointed you with the Spirit and led you forth to this arena, has seen good to separate you from a state of freedom for rougher treatment, that power may be made strong in you. For the athletes also are set apart for stricter discipline, that they may have time to build up their strength. They are kept from luxury, from daintier meats, from too pleasant drink; they are driven, tormented, distressed. The harder their labours in training, the greater their hopes of victory. And they do it, says the Apostle, that they may obtain a corruptible crown. We, with an eternal crown to obtain, look upon the prison as our training-ground, that we may be led to the arena of the judgment-seat well disciplined by every kind of discomfort: because virtue is built up by hardness, but by softness is overthrown" (_Ad Mart._, iii). It will be observed that Tertullian passes by an easy transition from training for military service to training for athletic contests. The whole passage is little more than a graphic amplification of what St. Paul writes to Timothy.