Summary of passage: God sends Assyria against his people who have angered him because they are godless. Then God will punish Assyria for their willful pride of heart and haughtiness.
5) Judah was godless and they angered the Lord.
6a) God disciplines us for our good that we may share in His holiness. Discipline produces a harvest of righteousness and peace. We will respect God if He disciplines us. As our father, He disciplines for our own good to teach us how to live and behave properly.
b) Galatians–understand and forgive others who fail. Hebrews–discipline comes from love. If God didn’t love us, He would let us fail and sin and end up in Hell. Discipline yields respect and is for our good so we may share in his holiness. It produces a harvest of righteousness and peace. The quoted passage is Proverbs 3:11,12
c) Personal answer. My answer: Hopefully, I’m learning the lessons God is trying to teach me although I may not understand and sometimes I question, I still keep my faith in His goodness, superiority, and plans for me. For my kids, I discipline them to teach them morals and values. It’s out of unconditional love and a desire to see them prosper in this world.
Conclusions: Questions 6a and b are very similar in nature and my answers reflect this. I had a hard time finding other passages about discipline AND love in the Bible. Hebrews seems to be the place where God lays it out the clearest. So feel free to comment on other passages you found.