John 1:1 states, “In the beginning was the Word, and the Word was with God, and the Word was God.” This verse established the fact that Jesus was both distinct from God the father, and was God in the fullest sense of who God is. Therefore, when Jesus spoke during his ministry on earth, he was not speaking for God, but as God.
In Isaiah 55:11, it was made clear that God would speak for himself at some point in the future, instead of through a prophet. He said, “So shall my word be that goeth forth out of my mouth; it shall not return unto me void, but it shall accomplish that which I please, and it shall prosper in the thing whereto I sent it.” In the same way that God spoke the physical world into existence, so he intended to speak a spiritual world into existence through the teaching of Jesus Christ.
The difference between God’s original work of creation and his work of salvation through Jesus was the eternal durability of the human heart. Whereas the heart of man was originally able to be broken and filled with sin, Jesus made it possible for man’s heart to be regenerated, to be born again (Titus 3:5). Isaiah declared of God, “I dwell in the high and holy place, with him also that is of a contrite and humble spirit, to revive the spirit of the humble, and to revive the heart of the contrite ones” (Isaiah 57:15).
The Hebrew word translated revive in Isaiah 57:15 is chayah (khaw – yaw´). This word means “to bring to life” or “to cause to live” (2421). In this instance, God was referring to causing someone to live again in both a physical and spiritual sense. When Jesus told the man Nicodemus he must be born again, Nicodemus asked, “How can a man be born when he is old? can he enter the second time into his mother’s womb, and be born? Jesus answered, Verily, verily, I say unto thee, Except a man be born of water and of the Spirit, he cannot enter the kingdom of God” (John 3:4-5).
The key to understanding Jesus’ response to Nicodemus’ question is the word and. Jesus said that a man must be born of water and of the Spirit. Water spoke of the natural birth, coming out of a mother’s womb, and the Spirit referred to the spiritual birth that took place when a person believed that Jesus was the Messiah. Only God could see the result, but Jesus assured Nicodemus that if he believed, Nicodemus would receive eternal life (John 3:16).