Emuna teaches that everything is from Hashem and His glory fills the world. The more a person has emuna, the more he or she knows that Hashem is everywhere. The more a person has emuna, the closer he or she gets to Hashem. The closer a soul is to Hashem, the more it feels at peace, like a baby in its mother's arms. So with emuna, no matter what Hashem does, we're at peace with it.