In Elie Wiesel's memoir "Night," the phrase "all creation bears witness to the greatness of God" employs the literary device known as personification. This device attributes human qualities to non-human entities—in this case, creation itself is depicted as having the capacity to witness and testify.
Additionally, this phrase can also reflect symbolism, as "creation" represents the entirety of the world and existence, which, in Wiesel's context, is a profound commentary on faith, spirituality, and the struggle to reconcile the existence of God with the horrors of the Holocaust.
Moreover, this line can be seen as part of a broader use of allusion, where Wiesel is invoking theological ideas about God's omnipresence and the relationship between the divine and the natural world.
Ultimately, this phrase encapsulates the complex interplay of faith and doubt that runs throughout the memoir.