It is the peace we are looking for. We may call it by whatever name but ultimately it is the peace that is our final object.
Though primarily we are looking for pleasures- we want success because it gives us pleasure; we want money and wealth because that gives us pleasure, we want physical intimacy because that gives us pleasure; and we want good food and dress because of that reason only. But after pursuing all these objects and even after acquiring them, we see the pleasure we were seeking is short lived and then for more of the same thing - bigger, better but same experiences get repeated throughout the life. And at last we feel we have been cheated. We feel disappointed, disillusioned and frustrated. Then comes the desire for peace. We feel peace is the ultimate thing.
This peace has been invoked in all the Upanishadas at their beginning and all of them ends with prayers for peace शान्ति पाठ
ॐ सह नाववतु सह नौ भुनक्तु सह वीर्य करवावहै। तेजस्वी नावधीतमस्तु मा विद्विषावहै। ॐ शान्ति: शान्ति: शान्ति:
This invoking peace three times in upanishada is a prayer to God for release from three types of pains -