Musar su Deuteronomio 20:10

The pillar of שלום, peace, is presented as part of the legislation dealing with warfare – provided the war is not against the seven nations who occupied Canaan at the time the Jewish people entered it – in order to show how the Torah stresses peace. The Torah nonetheless decrees the utter annihilation of all the inhabitants of the land of Caanan because true peace can only come about when the wicked have been removed or have become penitents. We are even commanded to preserve ecological "peace" when the plants in question are of immediate and universal use to man, i.e. fruit- bearing. Such plants must not be destroyed even if by doing so the war would be shortened. The anointing of the priest who addresses the soldiers on their way to battle is designed to assure the soldiers that G–d loves them and has their welfare in mind. When we love G–d there will be peace between G–d and us and war against our (His) enemies. This is why the Torah orders us not to fear our enemies.

In order to explain somewhat the quality of peace, I shall adduce some of the apothegms of Chazal on this subject. This is from Ma'aloth Hamiddoth: "Know, my sons, that peace is among the highest qualities, it being one of the names of the Holy One Blessed be He, as it is written (Judges 6:24): And he called it [(the altar) 'the L-rd-Shalom.'" Wherever peace is found, fear of Heaven is found. Where there is no peace, there is no fear of Heaven. Great is peace before the Blessed One, our sages of blessed memory saying in the aggadah (Yevamoth 65b, Bava Metzia 87a): "Great is peace, even Scripture prevaricating to maintain peace between Abraham and Sarah. For whereas she said (Bereshith 18:12): 'And my lord [Abraham] is old,' G-d transmitted this to Abraham as (Ibid. 13): 'And I [Sarah] am old.'" Similarly (Ibid. 40:16-17): "and they had it reported to Joseph: 'Your father commanded before he died: "So shall you say to Joseph: 'Forgive, I pray you, the offense of your brothers and their sin, for they accorded you evil.'" Now nowhere do we find Jacob commanding any such thing at all, for he entertained no apprehension whatever of Joseph's conduct. My sons, come and see how great is the power of peace, for the Holy One Blessed be He said that even foes should be approached with peace as it is written (Devarim 20:10): "When you draw close to a city to wage war against it, call out to it for peace." Great is peace, for it consummates the priestly benediction, as it is written (Numbers 6:26): "And He shall repose peace upon you." Great is peace, for it is the consummation of prayer, as it is written (Psalms 29:11): "The L-rd will give His people strength; the L-rd will bless His people with peace." And what is more, in the day of Israel's consolation, the first report shall be of peace, as it is written (Isaiah 52:7): "How comely upon the mountains are the feet of the herald, announcing peace!" My sons, come and see how great is the power of peace, for the Holy One Blessed be He said that even foes should be approached with peace, as it is written (Devarim 20:10): "When you draw near to a city to wage war against it, call out to it for peace." It was stated of R. Yochanan b. Zakkai that no one ever preceded him in greeting, not even a gentile in the marketplace. And our sages of blessed memory have stated (Avoth 4:15): "Extend greeting to all men." What is meant by greeting "all men"? Even if you see that he is ill disposed towards you, extend greeting to him; for if you do so, you will cause him to love you. What is more, even if he will not condescend to make peace with you, the Holy One Blessed be He will deliver him into your hand and humble him beneath you, as it is written (Devarim 20:1): "And if it [the city] does not make peace with you, but wages war against you, then you shall besiege it, and the L-rd your G-d will deliver it into your hand…" And so we find with David, may peace be upon him, that he pursued peace with Saul, as it is written (Psalms 120:7): "I am for peace, but when I speak, they are for war." Not only was Saul not appeased, but he pursued David to do him injury, and the Holy One Blessed be He delivered him into David's hand in the cave and in the encampment. And even so, it never entered David's heart to do him wrong. For one must love peace and pursue peace, as it is written (Ibid. 34:15): "Seek peace and pursue it." Seek it with your friend and pursue it with your enemy. Seek it in your place and pursue it in other places. Seek it with your body and pursue it with your money. [Sometimes one must be liberal with his money to seize upon the "stronghold of peace."] Seek it for yourself and pursue it for others. Seek it today and pursue it tomorrow. And do not despair, saying: "I will never achieve peace," but pursue it until you do achieve it. And what is the pursuit of peace? Thus have our sages of blessed memory said (Sanhedrin 110a): "This is speaking peace at a time of dispute and sacrificing one's honor for the general good, as was done by Moses, as it is written (Numbers 16:25): 'And Moses arose and he went to Dathan and Aviram…,'" and suspending one's affairs to make peace between a man and his wife, a man and his neighbor, and a teacher and his student — even to the extent of arranging a meal for two to make peace between them.

עמוד השלום . The outstanding lesson about the importance of the pillar "Peace" which the Torah teaches us is that, even while discussing the preparations under way to invade the land of the enemy, the Torah speaks about Israel offering a peaceful solution to the problems it encounters with its neighbors. We must keep in mind that in the last analysis רע, evil, did not originate in Heaven. The only reason there is such a thing as רע at all is so that the טוב may be be appreciated. I have discoursed on this subject at length. Once "evil" will be overcome, "good" will assert itself permanently. Anything which contains "good" must be seen to do so.