4:12 hardening hearts

On the other side, there are times when God hardens peoples hearts- such as pharoah. I imagine there's tendencies already there, and it all works with free will- perhaps they are given over to a natural tendency- like when Paul talks about God giving people up to their natural lusts.
“ For the wrath of God is revealed from heaven against all ungodliness and wickedness of those who by their wickedness suppress the truth. For what can be known about God is plain to them, because God has shown it to them. Ever since the creation of the world his eternal power and divine nature, invisible thought they are, have been understood and seen through the things he has made. So that they are without excuse; for though they knew God, they did not honour him as God or give thanks to him, but they became futile in their thinking, and their senseless minds were darkened. Claiming to be wise, they became fools; and they exchanged the glory of the immortal God for images resembling a mortal human being or birds or four- footed animals or reptiles.
Therefore God gave them up in the lusts of their hearts to impurity, to the degrading of their bodies among themselves, because they exchanged the truth about God for a lie and worshiped and served the creature rather than the creator, who is blessed forever! Amen.
For this reason God gave them up to degrading passions. Their women exchanged natural intercourse for unnatural, and in the same way also the men, giving up natural intercourse with women, were consumed with lust for one another. Men committed shameless acts with men and received in their own persons the due penalty for their error.
And since they did not see fit to acknowledge God, God gave them up to a debased mind and things which should not be done. They were filled with every kind of wickedness, evil, covetousness, malice. Full of envy, murder, strife, deceit, craftiness, they are gossips, slanderers, God-haters, insolent, haughty, boastful, inventors of evil, rebellious towards parents, foolish, faithless, heartless, ruthless. They know God's decree, that those who practice such things die- yet they not only do them but even applaud others who practice them.