"'In vain I punished your people; they did not respond to correction. Your sword has devoured your prophets like a ravening lion.'" NIV translation
God sent prophets to deliver a message of repentance to the people but they did not listen. God sent troubles upon the people but they did not humble themselves and repent. God is still the same today as He will send messengers to us and He will also send troubles if that is what we need to get back into His will for our lives. God disciplines His children because He loves us and wants the best for us.
"'You of this generation, consider the word of the Lord: "Have I been a desert to Israel or a land of great darkness? Why do my people say, 'We are free to roam; we will come to you no more'?"'" NIV translation
God asks these questions to get them to see how ridiculous it is to go from the provision of God to chasing after false idols.
If they (and we) would reflect on what God has done, then, they (and we) would see how foolish it is to turn away and chase the things of this world.
"'Does a maiden forget her jewelry, a bride her wedding ornaments? Yet my people have forgotten me, days without number.'" NIV translation
A maiden wants to look nice in order to find a husband and the bride wants to look nice for the groom. Therefore, they do not forget their jewelry but God's bride (His people) have stopped caring about how they present themselves to Him. This is even more relevant to God's people of today as it seems that many want to be saved from judgment but don't want to live like they are saved. This is the same type of thing that James was talking about in James 1:23-25.
"'How skilled you are at pursuing love! Even the worst of women could learn from your ways. On your clothes men find the lifeblood of the poor, though you did not catch them breaking in. Yet in spite of all this you say, "I am innocent; he is not angry with me." But I will pass judgment on you because you say, "I have not sinned."'" NIV translation
God compares their idolatry to the actions of even the worst of prostitutes. Not only are they accused of turning their back on God but also of neglecting the poor. It is interesting to note that God does not say that they are being judged for the sin but for the denial of the sin. That speaks to the fact that God will forgive us of our sins but only if we confess that it is sin.
"'Why do you go about so much, changing your ways? You will be disappointed by Egypt as you were by Assyria. You will also leave that place with your hands on your head, for the Lord has rejected those you trust; you will not be helped by them.'" NIV translation
God's people had turned from one country to the next for help instead of trusting in Him. God warns them that trust placed in anyone but Him is misplaced trust. The same is true for us in that our hope for everything is in Jesus Christ and we can look to people but they will always let us down.