Jeremiah 9  Is this Jeremiah's lament.. or is it the Lord's? Perhaps both.

Verse 3  "... and they do not know Me, declares the Lord."
Verse 6 ".. Through deceit they refuse to know Me, declares the Lord." 
Verse 13 "And the Lord said, ' because they have forsaken My law which I set before them, and have not obeyed My voice nor walked according to it, but have walked after the stubbornness other heart.."

The people chose  to live in idolatry, adultery, deceit, discord and "proceed from evil to evil."  They  turned completely away from the Lord their God.. and it broke His heart.  "Shall I not punish them for these things? declares the Lord.  On a nation such as this shall I not avenge Myself?" ( v9)

"Thus says the Lord, 'Let not a wise man boast of his wisdom, and let not the mighty man boast of his might, let not a rich man boast of his riches; but let him who boasts boast of this, that he understands and knows Me, that I am the Lord who exercises lovingkindness, justice, and righteousness on earth; for I delight in these things,' declares the Lord." ( v23-24)

Meditate on this..

Judah went so far away from the One who called them "His people", that they did not even know Him any more.  When He reached out to them over and over again.. they refused Him.  Even with the warnings of impending judgement, they stubbornly held to their own desires and forsook His Word and Law.  The Righteous Father  did what He had to do.. punish His rebellious children.

Our God is unchanging .  Our world has chosen this same path that Judah took.. many do not know who the True God is.  When they hear the Word, they refuse to acknowledge the Truth.  They do not want to give up their own desires so they reject His voice.  They boast of their wisdom, might, or riches... and they ignore the warning signs that judgement is coming.  But, it will come.. personally and universally.

Because of Jesus Christ, our Sovereign Lord, we are not without hope.  To understand and know Him.. to recognize His love and mercy, His justice, and His righteousness... is to find forgiveness for every sin, freedom from His wrath, deliverance from the punishment to come. Jesus paid it all!  All to Him I owe!

Father, may we delight in the things that delight You.. in lovingkindness, in justice, and in righteousness.  May we know You... more and more each day.  May we chose to walk in obedience to Your Word.. to have ears to hear and to heed Your voice.  Remind me.. remind us to keep walking byYour Spirit so that I/we will not carry out the desires of the flesh. Lead us Holy Spirit, I pray in the power of the Name that is above all others, Jesus Christ. Amen.