In this passage of John we learn quite a bit about Jesus.  Our culture does a good job at skewing who Christ really is and what His character is really like.  Some people say that Jesus is love- so He loves me however I am.  It is true that Jesus loves us in whatever state we are in, but His love transforms us, and it will conform us into beings after His own heart, desire, and will for our life. 

The words of Jesus have the power to heal, and give life.  He has the power of judgment because it has been given to Him by God the Father.  This means that Jesus really is the only key to heaven.  God will only accept those that have accepted His Son into their hearts.