1 Samuel 15:2

These things saith the Lord of hosts: I have reckoned, etc. An appropriate preface urging spiritual warfare, so that He who would command to engage in this should be known as the Lord of hosts; that is, of the angelic armies, by whose help we must be protected while fighting against the powers of the air. Egypt, which signifies darkness, represents past sins which followed us up to the sea of baptism but were drowned in it. But Amalek, who resisted Israel after crossing the Red Sea on the way through the desert, and whose name translates to "brutish people," signifies those sins which, after the waves of baptism, daily assail us with their weapons, striving to prevent us from reaching the promised kingdom of the heavenly homeland; so that we do not preserve the fruit of our hearts in sanctification, attempting to rip it away with deadly temptation. All these we are ordered to utterly destroy and show no mercy to; that is, put away everything for which the wrath of God comes upon the children of disobedience: anger, wrath, malice, blasphemy, filthy language from your mouth, and such like.

What is meant by the deeds of the Amalekites being recounted, except that the defilements of lust are greatly hateful to God? Whence the blessed apostle Paul says: 'Every sin that a man doeth is without the body; but he that committeth fornication sinneth against his own body' (1 Cor. 6:18). Likewise he says: 'Whoremongers and adulterers God will judge' (Heb. 13:4). Hence also, rebuking more sharply and separating them from the kingdom of God, he says: 'Neither shall the unclean possess the kingdom of God' (Eph. 5:5). Why is lust recounted, except because the sinner is cast out by the justice of God, when he bends himself to perpetrate its defilements? He who is recounted, therefore, so as to fall, is sometimes recounted so as to perish, and sometimes recounted so as to rise again. And because the deeds of Amalek are recalled after such great spans of time, it is in some way suggested to us that such people sometimes come to their senses after long periods. Moreover, his deeds are described when it is said: 'How he withstood him on the way when he was going up out of Egypt.' Israel means "seeing God." Because he is said to go up out of Egypt, this signifies the newly converted, who abandon the darkness and depths of sins, draw near to the light of truth, and ascend the mountain of good works. But Amalek opposed Israel on the way, because lust hurls the weapons of pleasure against those striving toward the summit of perfection, and strikes with the sword of impure suggestion whatever hearts it can. And because the battle of fornication is exceedingly strong and violent, Amalek is said not merely to have confronted Israel in some ordinary way, but to have resisted him. To resist indeed is to press upon someone with a fierce assault. That Israelite who was ascending surely saw these resisting Amalekites when he said: "I see another law in my members, warring against the law of my mind" (Rom. 7:23). Whence also, looking to his helper, he says: "Wretched man that I am, who will deliver me from the body of this death? The grace of our Lord Jesus Christ" (Rom. 7:24). Amalek is therefore said to resist because, as long as we are in the flesh, we endure the fierce wars of lust. But why is he said to resist those ascending from Egypt? Behold, he who had been caught up to the secrets of the third heaven still had the resisting motions of the flesh. Rightly therefore…