Matthew 4:23-25 And he went throughout all Galilee, teaching in their synagogues and proclaiming the gospel of the kingdom and healing every disease and every affliction among the people. 24 So his fame spread throughout all Syria, and they brought him all the sick, those afflicted with various diseases and pains, those oppressed by demons, epileptics, and paralytics, and he healed them. 25 And great crowds followed him from Galilee and the Decapolis, and from Jerusalem and Judea, and from beyond the Jordan.
Jesus came to save His people from their sins (Matthew 1:21). He began His work by proclaiming the gospel of the kingdom and healing every disease and affliction among people. What exactly was He proclaiming? Gospel means "good news". The primary meaning of "kingdom" means "the sovereign rule of a king." Jesus came proclaiming the good news that God was establishing His sovereign rule among men. The rule begins now in all who believe Jesus died for their sins on the cross, rose again from the dead on the third day and is Lord of their lives. When a person believes in Jesus' gospel, the Holy Spirit enters and empowers the person to live in victory over sin and Satan. The person receives pardon from all sin, power to live in freedom from sin and the hope of living free from the presence of sin when Jesus returns to usher in a new heavens and earth.
Jesus proved He was the person to save the people from their sins by healing the people from all their sin caused afflictions, diseases, pains and oppression by demons. What Jesus promises us now is every spiritual blessing needed to live an abundant life and enough material blessing to sustain our physical bodies. Jesus promises all who believe in Him every physical blessing when He returns and a place with Him when we die before He returns.
We learn what it means to live under His sovereign rule by reading the Bible. We need to read some each day to learn how we can live an abundant and eternal life now and forever. Begin by systematically reading Genesis 1-12 and then go to Matthew and read systematically through the entire New Testament.