Jeremiah 9: 23 - 24

Thus says the Lord: Do not let the wise boast in their wisdom, do not let the mighty boast in their might, do not let the wealthy boast in their wealth; but let those who boast boast in this, that they understand and know me, that I am the Lord; I act with steadfast love, justice, and righteousness in the earth, for in these things I delight, says the Lord. ²⁴

 In the end the only thing that counts at all is that one has come to understand that our God is God and that he acts, always, in steadfast love, justice and righteousness. This is no harder to believe now than it was for the people of Jeremiah's time. But to understand God in this way gives us the way that we can come to know him.