The third part of the book of Isaiah was probably not written by the prophet, this part of the book is set during the return of the Jews to the holy land after the captivity in Babylon.
This third part calls man to remain faithful to the Lord, and to avoid idolatry because God has a salvation plan and at the end of time there will be a new heaven and a new earth.
And this part of the book tells us about a very particular problem, the nature of sin, and about this, the prophet wrote with wisdom:
"Surely the arm of the LORD is not too short to save,
nor his ear too dull to hear.
But your iniquities have separated
you from your God;
your sins have hidden his face from you,
so that he will not hear" Isaiah 59:1-2.
Whoever sins, Isaiah taught us, breaks his relationship with the creator of all things, and therefore God cannot save this kind of people. Faced with sin, God leaves men to face the results of their own actions, the law of sowing and reaping is a cosmic law, of balance, learning, and retribution that inevitably affects men: "They sow the wind and reap the whirlwind" Hosea 8:7.
And sin brings with it something else, the spiritual blindness, that is, the lack of understanding and wisdom in decision-making, that is why a sinner is like a blind man because sin implies an erroneous or limited evaluation of reality.
And not only that, sin can metaphorically be associated with a road in the middle of the dark, because sin brings with it destructive unforeseen events that, like stones on the road, make men fall.
With this metaphor, the prophet describes the path and the life of the people who practice sin:
"We look for light, but all is darkness;
for brightness, but we walk in deep shadows.
Like the blind we grope along the wall,
feeling our way like people without eyes.
At midday we stumble as if it were twilight;
among the strong, we are like the dead" Isaiah 59:9-10.
The one who sins is constantly forced to improvise, to make surprising and short-term decisions, because the person is forced to avoid or evade the self-destructive consequences of sin. Sin forces people to act unpredictably, to constantly test reality, because the sinner never knows where a danger can appear from.
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