Christ did miracles to authenticate His claims to be the Messiah. John called these supernatural acts “signs”-events intended to point people to God, to signal the presence of God with His people. Who but God has authority over nature, disease, death and evil? A carpenter from Nazareth calming a raging storm, giving sight to the blind, calling Lazarus from the tomb, and driving out demonic spirits, emphatically demonstrates that He is the Son of God.