It seems like given the context of that chapter, Isaiah was referring to spiritual sickness, not physical diseases. However, there is some truth to the fact that in the future, diseases we know of today such as Alzheimer’s and cancer will be eradicated, because of advances in medicine.
I fully agree. I believe that humans have two natures, a lower selfish nature and a higher spiritual nature, and we have a brain and free will to choose between the two.
Baha’is do not believe that there is an actual being called Satan but rather Satan refers to the lower selfish nature of man, called the satanic self. That is a visible force at work in the world today but over time that will change and people will learn to live in unity and peace. Isaiah foresaw this:
Isaiah 11:6-9 The wolf also shall dwell with the lamb, and the leopard shall lie down with the kid; and the calf and the young lion and the fatling together; and a little child shall lead them. And the cow and the bear shall feed; their young ones shall lie down together: and the lion shall eat straw like the ox.And the sucking child shall play on the hole of the asp, and the weaned child shall put his hand on the cockatrice' den.They shall not hurt nor destroy in all my holy mountain: for the earth shall be full of the knowledge of the Lord, as the waters cover the sea.
What this means to a Baha’i is that In the future diverse religions and races will become friends, the contentions of races, the differences of religions, and the barriers between nations will be completely removed, and all will attain perfect union and reconciliation. Eventually, there will be only one religion, the religion of God.
This one religion was also foretold by Jesus:
John 10:16 And other sheep I have, which are not of this fold: them also I must bring, and they shall hear my voice; and there shall be one fold, and one shepherd.
As I said in my previous post above I do not believe that Jesus is going to return because I believe the Christ Spirit promised to be sent by Jesus (the Comforter and the Spirit of truth) has already returned in the Person of Baha’u’llah. The new righteous world will be established under Baha’u’llah during the Golden Age of mankind.
I believe those refer to the long-awaited Golden Age of mankind. God’s promise is the same thing as God’s purpose.
“God’s purpose is none other than to usher in, in ways He alone can bring about, and the full significance of which He alone can fathom, the Great, the Golden Age of a long-divided, a long-afflicted humanity. Its present state, indeed even its immediate future, is dark, distressingly dark. Its distant future, however, is radiant, gloriously radiant—so radiant that no eye can visualize it......
What we witness at the present time, during “this gravest crisis in the history of civilization,” recalling such times in which “religions have perished and are born,” is the adolescent stage in the slow and painful evolution of humanity, preparatory to the attainment of the stage of manhood, the stage of maturity, the promise of which is embedded in the teachings, and enshrined in the prophecies, of Bahá’u’lláh. The tumult of this age of transition is characteristic of the impetuosity and irrational instincts of youth, its follies, its prodigality, its pride, its self-assurance, its rebelliousness, and contempt of discipline.”
You can read the whole passage on that link if you want to know what I believe is going to happen between para 1 and para 2.