Core of the Teaching by Christ Jesus
Christ Jesus taught very basic matters that were related to everybody in addition to Judaists living 2000 years ago. That is why His teaching can survive 2000 years and can be understood by everybody in the world.
And such basic matters as related to everybody are love and animosity, good and bad, and relationship between human beings and God as well as life after death. Christ Jesus behaved and taught as somebody who had been given all the knowledge about these matters by God.
The depth of His teaching and the strength of his authority have appealed many people in these 2000 years. However, there are many people who cannot understand significance of His teaching on love and animosity, good and bad, and relationship between human beings and God as well as life after death. Those who are driven by their desire or brainwashed by worldly wisdom cannot appreciate value and importance of the teaching of Christ Jesus.
People are born, live, and die no matter what lives they might have. But people have souls and spirits that are cores of their existence. And, what are important for souls and spirits was taught by Christ Jesus. Put simply, it is God that creates souls and spirits of human beings. And, if human beings do not live in accordance with the teaching of God, their souls and spirits are lost forever. However, if they follow the teaching of God, they will be given eternal life to their souls and spirits, which is the core of the teaching of Christ Jesus.
But those who want to be rich and succeed in this world cannot understand the teaching of Christ Jesus, even if they are priests or any other members of Christian churches.
So, they cannot even accept the teaching: Love God and hate money.
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Mar 4:12 That seeing they may see, and not perceive; and hearing they may hear, and not understand; lest at any time they should be converted, and their sins should be forgiven them.