When we feel life's perfection, we feel that glory of the moment, and we realize that all is working out just as it should. However it is the ego that brings us back from the timeless awareness of life's miracle. The ego has us questioning and judging. The ego does this because it feels threatened. Threatening because judgment, of life, of oneself, and of others becomes rendered irrelevant.
Many of us can only hold that "in the moment glory" for only short amounts of awareness. In the moment of realizing life's perfection the ego witnesses that it's judgments are irrelevant so it acts to reconcile its annihilation. The ego fears losing its identity so it utilizes the unconscious mind to fear oneself into doubting perfection. Because it is the realization of perfection that abolishes the ego. It is death in a sense, however only in the ego's death are we liberated from the illusory separation from spirit.
The ego can rest assured though. As there is no such thing as complete annihilation, for it is spirit that created creation, of which ego is a by-product. The knowing that we are alive after the ego's death is what brings absolute peace. Because in the ego's death we know, without question, that we are a part of something larger the perceived self.