With His will he exercises mercy where He wishes and doesn't where he doesn't want to
No he doesn't. God only gives blessings. He doesn't change. He lets His light shine on the just and the unjust. He is not consistent ebcause He is "obligated" to be consistent, but because He is consistent by nature; that how He is.
God desired for a reconciliation between Himself and man. Yet, he could not allow man's sin to go unpunished without violating His justice
Don't be silly, Blogger. Man's sin is man's punishment. It hurts us, not God. Man has already been punished. In fact, man is al;ready born punished (sentenced to death).
We are unjust to God every day, every hour, every second. That does not make God suffer. It makes us destined to hell unless we repent and change our ways. It is our continuous ingratitude to God's unchanging and generous love that puts us on the path of perdition, not God.
God does not just "pour out blessings" God is also a God of anger and wrath. He is a judge.
And again - you are the one who doesn't get it. You missed a word I said several times. "IF" If God wanted to reconcile man to himself THEN he would have to do so in a way that did not violate His nature.
Scripture says that the Holy Spirit is grieved by our sin. Christ Himself took our punishment by suffocating on a cross with spikes driven through his body. And God isn't hurt by our sin?
Our unjustness isn't the matter. It is God's justice. God will always be true to His nature. He can not violate who He is.