I came across this interesting and challenging observation in Knowing Jesus Through the Old Testament by Christopher J.H. Wright.
The people of God as a whole will be characterized as a community who know Him. Now if we go on to ask what it means to know God, Jeremiah allows us no sentimental feelings of private spiritual piety. He is absolutely clear. To know God is to delight in faithful love, justice and righteousness, as God himself does (9:24). More than that, it means not only to delight in such things, but actually to do righteousness and justice by defending the rights of the poor and needy - that is to know God. Jeremiah defines the knowledge of God in one of the most challenging verses in the Bible.
"Your father (i.e. Josiah) did what was right and just.
He defended the cause of the poor and needy and so all went well.
Is that not what it means to know me?" declares the Lord. (Jer. 22:15-16)