Arianism is the most famous and most durable Christological heresy in church history. Arius taught that "there was a time when the Son was not" — that the Son was created by the Father before anything else, but created nonetheless. In His view, Christ was the highest creature, the means through whom God made all other things, worthy of veneration — but not God in the full sense. Athanasius of Alexandria led the orthodox opposition, insisting that "if the Son is a creature, we are still in our sins, for no creature can save us." The Council of Nicaea (325) condemned Arianism and produced the Nicene Creed, which declared the Son to be "of one substance [homoousios] with the Father, God from God, Light from Light, true God from true God, begotten, not made." Despite the condemnation, Arianism persisted for centuries. After Nicaea, the Arian party regained political power under several Eastern emperors, and the church entered nearly 60 years of turmoil in which, as Jerome famously put it, "the world groaned and was astonished to find itself Arian." Modern descendants of Arianism include the Jehovah's Witnesses, Mormons (in one form), and various Unitarian groups. The core issue is whether Jesus is truly God. If He is not, then no one He saved was saved; the whole Christian faith collapses. This is why the early church fought so hard over what looked to modern eyes like a single Greek word.