The reason is that Jesus' twofold commandment is the commandment of the Kingdom of Heaven
(the new heaven and the new earth).
The Pharisees, who tested Jesus with cunning intentions to trap Him,
and the Sadducees, who misunderstood
due to their ignorance of the Scriptures and God's power,
were ultimately silenced by Jesus' words.
As a result, both the Pharisees and the Sadducees gathered together
(Matthew 22:21, 34).
Then, one of them, an expert in the Law, tested Jesus by asking,
"Teacher, which is the greatest commandment in the Law of Moses?" (vv. 36).
Jesus answered:
"Love the Lord your God with all your heart,
with all your soul, and with all your mind.
This is the greatest and most important commandment.
The second is like it: ‘Love your neighbor as yourself.’
All the Law and the Prophets depend on these two commandments" (vv. 37-40).
Though the expert in the Law asked Jesus
which commandment in the Law of Moses was the greatest,
Jesus responded that "all the teachings of the Law and the Prophets" are
based on His twofold commandment of loving God and loving one’s neighbor.
As I meditate on this passage,
I see that in the Old Testament (the Old Covenant),
the Ten Commandments of Moses were regarded as the most important.
However, in the New Testament (the New Covenant),
Jesus emphasized that the most important commandments are
"Love for God"
(which corresponds to the first four commandments of Moses)
and "Love for one’s neighbor"
(which corresponds to the last six commandments of Moses).
The reason is that Jesus' twofold commandment is
the commandment of the Kingdom of Heaven—
the new heaven and the new earth.