Open Your Mind
"Then He opened their minds so they could understand the Scriptures. He told them, “This is what is written: The Messiah will suffer and rise from the dead on the third day, and repentance for the forgiveness of sins will be preached in His name to all nations, beginning at Jerusalem." (Luke 24:45-47)
The only way to "understand the Scriptures" is for Jesus to open your mind.
"Do not be conformed to this world, but be transformed by the renewing of your mind. Then you will be able to test and approve what is the good, pleasing, and perfect will of God. Do not conform to the pattern of this world, but be transformed by the renewing of your mind." (Romans 12:2)
When Jesus opens your mind you will see the plan of God for humanity was for the Messiah to "suffer and rise from the the dead".
And you will see the Devine result of His suffering, death, and His resurrection - to provide the way for humanity to "inherit the kingdom of God":
"He is the image of the invisible God, the firstborn of all creation." (Colossians 1:15)
"Just as we have borne the image of the man of dust, we shall also bear the image of the man of heaven. I tell you this, brothers: flesh and blood cannot inherit the kingdom of God, nor does the perishable inherit the imperishable. Behold! I tell you a mystery. We shall not all sleep, but we shall all be changed, in a moment, in the twinkling of an eye, at the last trumpet. For the trumpet will sound, and the dead will be raised imperishable, and we shall be changed. For this perishable body must put on the imperishable, and this mortal body must put on immortality. When the perishable puts on the imperishable, and the mortal puts on immortality, then shall come to pass the saying that is written:
“Death is swallowed up in victory.”
“O death, where is your victory? O death, where is your sting?”
The sting of death is sin, and the power of sin is the law. But thanks be to God, who gives us the victory through our Lord Jesus Christ. " (1 Corinthians 15:49-57)
"And we all, with unveiled face, beholding the glory of the Lord, are being transformed into the same image from one degree of glory to another." (2 Corinthians 3:18)
The word "forgiveness" means complete forgiveness, a release from the consequences of sin - humanity will be released from death, the penalty for sin, and transformed from death into the immortal image of Christ. The word "repentance" means change and reformation - your mind will be changed to understand that the reformation of humanity into the immortal and sinless image of Christ is what is to be "preached in His name to all nations".