Theology makes all the difference in your life. In John 10, as John Piper explains, the doctrine of Jesus’s deity is presented in terms of its upmost impact on how we live. In short, because Jesus and the Father are one, our souls are incredibly secure (John 1:28–30). Biblical doctrine is not for the abstract. It’s for where you are right now. This excerpt is from the sermon, “I and the Father Are One” (August 20, 2011).