Every one of the actions in verses 18-19 has to do with words. Everything that came out of Him came out of an absolutely pure heart. He said, "I'm going to preach the gospel to the poor." The poor are those deprived or powerless, and the reason for His preaching was to give them vision and hope. Moses gave the enslaved Israelites good news of a similar sort: "God is going to free us and lead us to our own land."
Then Christ says, "I'm going to heal the brokenhearted." He means those whose hearts are broken in repentance. It is as if He says, "I'm going to take care of all your past mistakes. I will heal you and give you comfort so you can start out the journey to the Kingdom of God in good spiritual condition."
After this He says, "I'm going to preach deliverance to the captives." He will inspire enthusiasm and give hope for a bright future. He will recover the sight of the blind. He will provide truth, and therefore direction and clear thinking, to people. He will set them at liberty by forgiving them of their sins—and keep them free. He will preach the acceptable year of the Lord—the time is now—and instill them with urgency. Each of these steps is Him working on our mind.
Hardly any of us have moved an inch, as it were, since our calling. Most of us live in the same general area in which we were called. Even if we did move around the country, we are still under the same human government. Our location does not matter to God. He is after our mind. He wants to change the heart until it is pure like His Son's. In all of these functions, God is working on the mind by means of His word, His truth, empowering us through an educational process, and by the addition of His Spirit to make the best possible use of our free moral agency in our lives.
John 1:12 says—in the chapter where Jesus is identified as the Word of God, the Logos, and as the Light of the world, which is the truth of God that points out the way—that we are given the right to be sons of God. The word "right" is an accurate translation, but the marginal reference is better: "authority." Perhaps an even better word is "empowered," which is the Greek word's real meaning. We are empowered to become part of the Kingdom of God. That empowerment has come by means of God's calling, the revelation of His purpose through His Word, and all the other instruction that is necessary for the accomplishment of the great purpose God is working out.
That Word He has revealed to us is pure and unadulterated. It is the unleavened bread of sincerity and truth.