In these passages Isaiah speaks of the coming Kingdom of the Lord here on the Earth and of those who will be living in His Kingdom. They will be taught God’s Truths and how to live. Residents of God’s Kingdom will be those who have sought and valued God more than earthly pleasures.
God says through Isaiah, “Why do you spend money for what is not bread and your wages for what does not satisfy? Listen carefully to me, and eat what is good and delight yourselves in abundance. Incline your ear and come to Me. Listen that you may live.” If we want to live with God in his Kingdom then we must value God over worldly pleasures and riches. We must not strive to become rich. Rather we must strive to live rightly before God. When we do that God will also give us physical blessings in our lives. The Bible says, “Seek first the Lord and His righteousness and the rest will be given you as well.”
When Solomon became king of Israel, God spoke to him in a dream asking Solomon what he wanted God to do for him. Solomon didn’t ask for riches. Rather, he asked God to give him wisdom so that he could be a good king. God granted Solomon’s wish and Solomon became the wisest king that ever lived. Got also granted Solomon great wealth because Solomon had asked for something of true value instead of money. We too should seek for things of true value, things that will last. Physical riches will depart from us when we die, but the love of God will last forever.