"There is a judge for the one who rejects me and does not ..." (John 12:48-49)

"There is a judge for the one who rejects me and does not accept my words; that very word which I spoke will condemn him at the last day. For I did not speak of my own accord, but the Father who sent me commanded me what to say and how to say it." (John 12:48-49)
This statement by Jesus illustrates the importance Jesus placed on his teachings, as well as the Source of his teachings.

My words?

The term"My words" is a slight mistranslation. "Words" is being derived from the Greek word λόγος (logos), which can mean "words," but also "sayings," "doctrine" or "teachings" Within the context of Jesus' statement, "teachings" is the most appropriate translation.

We might better quote a more common sense translation from the Gospels of Jesus:
"Yet one who rejects me and does not follow my instructions will be condemned: The Teachings I spoke will condemn them at the time of death. For I speak not from myself but the Creator Himself who sent me gives me instructions as to what to teach and what to say." (John 12:48-49)
This reveals the critical nature of hearing Jesus' teachings, and following them. Accepting someone's teachings does not mean to simply give lip service. It means to follow those teachings.

By Jesus linking the acceptance of his teachings with rejecting him, he is binding his purpose and his mission to what he is teaching.

The statement indicates that Jesus' teachings not only can enlighten the listener, but rejecting his teachings will have negative consequences. The phrase "the last day" in sectarian translations indicates the time of death from the Gospels of Jesus. This indicates consequences received following the death of this body.

What are those consequences?

And what are the negative consequences that will befall one who hears but ignores Jesus' teachings? Going to hell?

Rather, those who have access to, but ignore Jesus' teachings are already in hell. And those who throw away the opportunity to regain our relationship with the Supreme Being - the substance of Jesus' teachings - lose that opportunity, and thus inherit a future of ignorance and darkness.

We must also be clear that following the teachings of ecclesiastical (professional) sectarian teachers and their organizations - which focus upon using Jesus' crucifixion to relieve the consequences of self-centered behavior (sins) - is also ignoring Jesus' teachings.

Sectarian teachers also like to teach that Jesus is God. This is also ignoring Jesus' teachings, as Jesus clearly states that this is not the case.

"There is a judge for the one who rejects me..." indicates the separate existence of a judgment outside of Jesus.

"For I did not speak of my own accord" also clarifies the distinction between Jesus and the Supreme Being. If Jesus did not speak of his own accord as he spoke of God, Jesus could not possibly be God.

Jesus then clarifies his connection with the Supreme Being  "....the Father who sent me commanded me what to say and how to say it."

This should make crystal clear the relationship between Jesus and God. Jesus was sent by the Supreme Being. This means that Jesus is God's messenger and thus representative. Anyone sent by someone else is acting as that person's messenger and speaking on their behalf makes them their representative.

Furthermore, since the Supreme Being commanded Jesus regarding what to say and how to say it, we know that Jesus is serving God. A person who follows the commands of another is acting as that person's subordinate, and their actions comprise servitude. And if that service is done voluntarily, it is based on love.

Jesus is God's loving servant

Loving servitude is when a person follows the instructions ("commands") of another specifically and precisely - because they want to do what pleases the other person. Since Jesus not only said what the Supreme Being commanded him to say, but said it in the manner commanded by God, we can know that Jesus is not God: He is God's loving servant and messenger. This makes Jesus God's representative.

We can also see in Jesus' statement a significant amount of humility. It was not as if Jesus considered himself so knowledgeable. The fact that he followed God's commands specifically means that Jesus saw himself as simply a humble loving servant of the Supreme Being, and that Jesus enjoyed a private and intimate relationship with God.

Jesus stated clearly that he is teaching what God wants to teach us:
“My teaching is not my own. It comes from the One who sent me." (John 7:16)
This also means that Jesus' most important teaching actually was coming from the Supreme Being:
“‘Love the Lord your God with all your heart and with all your soul and with all your mind.' This is the first and greatest commandment." (Matt. 22:37-38)
When we put this "first and greatest" teaching together with Jesus' statement in John 12:48-49, we can know that above all, God wants our love. He wants us to return to our loving relationship with Him because He knows that only this will make us happy. The Supreme Being wants us to be happy because He loves each of us intimately.