John 12 brings an end to Jesus’ public ministry before His crucifixion. The last words of His teaching that John records are about the coming judgment. Jesus tells us that we will be judged based on His word.
Knowing the standard of judgment helps us prepare for that day. It also tells us what won’t be important on that day. The teachings of religious teachers, preachers, or the church, synods, catechisms, creed books councils, the practices and beliefs of our family or friends, and even what we ourselves felt, thought, or believed will not be the standard.
We will be judged based on what Jesus taught. He goes on to say that He got His teaching from the Father and that this teaching is eternal life. We must carefully listen and obey.