The sages teach: "We say the blessing as the verse is written in the Bible and do not alter the formula that appears in the verse. But if so, what about the continuation of the verse: “Who makes peace and creates evil”? Do we say this blessing as it is written in the Bible?
Rather, it is written evil and we euphemistically recite the blessing all things to avoid mention of evil. Here, too, let us euphemistically say brightness (nogah) instead of darkness (hosech).
Rather, Rava said: The reason we recite: “Who creates darkness” is in order to mention the attribute of day at night and the attribute of night during the day, and thereby unify day and night as different parts of a single entity.
[ח] שמא תאמרו "הרי מאכל, הרי משתה; אם אין שלום, אין כלום!"תלמוד לומר "ונתתי שלום בארץ"-- מגיד שהשלום שקול כנגד הכל. וכן הוא אומר (ישעיהו מה, ז עיין שם) 'עושה שלום ובורא את הכל'-- מגיד שהשלום שקול כנגד הכל.
8) Lest you say "There is food and there is drink, but without peace there is nothing!"
Therefore, the Torah teaches (Lev. 26:6) "And I will make peace in the land" — thus it is said that peace is equal to everything. As it is written: "I form light and create darkness, make pace and create 'all.'