Chovot Halevavot, the classical work on Jewish ethics, was authored by Rabbi Bachya ben Yosef ibn Paquda (the first "Rabbeinu Bechayei") on or before 1161, and translated into Hebrew from the original Arabic by the famed translator R. Judah ibn Tibbon in 1167. It was first published on the 25th of Tevet of the year 5319 from creation (1559).
First there was One. There was no peace, because there was nothing with which to make peace. There was only One.
Then there was Two. There was diversity. From this point on, an infinite cacophony of conflict extended in all directions and forever.
And on the third day G‑d created peace.
Peace is not homogeneity. Peace does not mean that everyone thinks the same way. Peace is when there is diversity that finds a higher Oneness.