But Jesus did not only speak with authority. He also acted with authority. And thus, His works serve to substantiate His claims. What were His works? By the time of the preaching of this Sermon, according to Matthew (4:23-25), Jesus had already healed various types of sickness among the people and had cast out demons. They were yet to see lepers cured, the eyes of the blind opened, the dead raised to life, the storms stilled, water turned to wine, thousands fed from just a few shreds of lunch, and heaven opened. These works were meant to accredit Him by revealing the source of His teaching. We cannot study them candidly without coming to the conclusion reached by Nicodemus: “Rabbi, we know that thou art a teacher come from God; for no man can do these miracles that thou doest, except God be with him” (John 3:2).