Boast about they have the understanding to know the Lord

Jeremiah 9:1-26
They do not acknowledge me declares the Lord.
Friend deceives friend, and no one speaks the truth. They have taught their tongues to lie; they weary themselves with sinning. In their deceit they refuse to acknowledge me, declares the Lord.
Who is wise enough to understand this? Who has been instructed by the Lord and can explain it? Why has the land been ruined and laid waste like a desert that no one can cross?
It is because they have forsaken my law, which I set before them; they have not obeyed me or followed my law.
Let the one who boasts boast about this: that they have the understanding to know me, that I am the Lord, who exercises kindness, justice and righteousness on earth, for in these I delight, declares the Lord.
I will punish all who are circumcise only in the flesh.
It is not always clear here whether the speaker is Jeremiah, God or the people. Jeremiah shares God's own deep grief at his people's sin and its tragic consequences. Society is sick; sick as a direct result of the nation abandoning God and his laws and going their own way. So inevitable has judgment become that the professional mourners can already be called in.
Why?
Deceit is sin before the Lord and detestable thing among people. No one like lier, people like the truth, but people are always do not know what is the truth for there are many sins among society.
Circumcise is a ceremony in the flesh, God like us be circumcised in the heart, let the whole man whole heart belong to the Lord.
Who is wise man? Who can boast? What can I boast? Only those who understand the Lord is Almight God, Only boast for the God's great mercy and grace on me. I can boast nothing excep the Lord.
How?
Be humble and boast the grace and righteousness of the Lord.