An interesting understanding of of Jeremiah 17:9, I learned years ago from my pastor who was able to teach masterfully from the Hebrew and Greek texts. Pastors ordered his recorded messages for their personal study.
"The heart is deceitful above all things, and desperately wicked; who can know it?"
The passage hardly ever gets analyzed in it's proper context for why it was said.
That was stated concerning the rebellious Jews who were in an utterly self destruct mode.
Jeremiah was dealing with a totally deranged people.
A people that had degenerated into a culture of great evil.
For the Jews in his day were holding public orgies, which included phallic statues on display for female masturbation, and a burning furnace for child sacrifice while the orgies took place..
Thus... While pointing to the people? God through Jeremiah, was actually saying.
"The deceitful heart above all things is desperately wicked; who can know it?"
What we see bantered around today was not some generalized open statement made in reference to all men. .
It was pertaining specifically about the rebellious Jews who God was about to destroy.
In spite of it all. Jeremiah loved his people. That is what he was called "the weeping prophet."
I am now thinking of reordering that Jeremiah series to brush up.
It was specific!
"The deceitful heart above all things is desperately wicked; who can know it?"
God will provide for our every need.