G-d is in control!

[Isa. 45:1] Thus saith the LORD to his anointed, to Cyrus, whose right hand I have holden, to subdue nations before him; and I will loose the loins of kings, to open before him the two leaved gates; and the gates shall not be shut;
Thus says the L-RD to Cyrus: Isaiah carries on this remarkable prophecy from the previous chapter. In it, G-d announces - by name - the deliverer for His people from a coming captivity, and He does it 200 years before the man Cyrus is born. These things Cyrus knew from reading the book of prophecy which Isaiah had left behind two hundred and ten years earlier.
His anointed means that Cyrus had a particular anointing from G-d for His work. G-d poured out His Spirit on a pagan king, because G-d wanted to use that man to bless and deliver His people.
Like many of us, Cyrus could look back on his life and career and see how the L-RD held his hand the entire time.
To open before him the double doors, so that the gates will not be shut: G-d opened the gates of the city of Babylon for Cyrus, and put it in writing 200 years before it happened!
[2] I will go before thee, and make the crooked places straight: I will break in pieces the gates of brass, and cut in sunder the bars of iron:
[3] And I will give thee the treasures of darkness, and hidden riches of secret places, that thou mayest know that I, the LORD, which call thee by thy name, am the God of Israel.
[4] For Jacob my servant's sake, and Israel mine elect, I have even called thee by thy name: I have surnamed thee, though thou hast not known me.
G-d raises up one, and He puts down another. Behind all the drama of human events today there is a G-d who is planning for His people - through affliction and persecution, chastening and tribulation - to be perfected and prepared to inherit the Kingdom of G-d.
[5] I am the LORD, and there is none else, there is no God beside me: I girded thee, though thou hast not known me:
I will gird you, though you have not known Me: Cyrus didn't even know the L-RD, yet G-d could anoint him, guide him, bless him, and use him. How much more should G-d be able to do through those who have at least a mustard seed's worth of faith in Him!
[6] That they may know from the rising of the sun, and from the west, that there is none beside me.
I am the L-RD, and there is none else.
There is none besides Me - This was wonderfully fulfilled in Ezra 1:1-3. That passage shows how when Cyrus made his proclamation allowing the people of G-d to return to the Promised Land, that he acknowledged to the whole world the greatness and uniqueness of the L-RD G-d of Israel.
[7] I form the light, and create darkness: I make peace, and create evil:
I the LORD do all these things.
I make peace and create calamity; I, the L-RD, do all these things: Simply put, Isaiah knows, Cyrus would know and declare to the whole world, and we should know today, that G-d is in control. Since this prophecy was given long before G-d's people went into the captivity Isaiah now announces deliverance from, they could be comforted through the captivity by knowing G-d is in control.
Isaiah's point is that there are not two gods or forces in heaven, one good and one bad, as in a dualistic "yin and yang" sense. Cyrus was a Persian, and Persian had a dualistic concept of G-d and the world. Their good god they called Ahura-mazda and the evil god Angra-mainya. The former had created the light, the second the darkness.
But G-d has no opposite. Satan is not and has never been G-d's opposite. There is one G-d. He is not the author of evil; evil is never "original," but always a perversion of an existing good. Yet G-d is the allower of evil, and He uses it to accomplish His eternal purpose of bringing together all things in Y’Shua (Ephesians 3:8-11 and 1:9-10).
Creat evil - Even though much of the physical evil often comes through the hand of wicked men and women, ultimately G-d permits it. Thus, according to the Hebrew way of speaking, which ignores secondary causation in a way Western though would never do whatever G-d permits must be directly attributed to Him, often without noting that secondary and sinful parties were the immediate causes of physical disaster.
The evil spoken of in this text refers to natural evil and not moral evil. Natural evil is seen in the volcano eruption, plague, earthquake, and destructive fire. It is G-d who must allow these calamities to come.
Evil is not a substance; it is a by-product of our freedom, and especially our sin. The effects of that sin did not fall solely on the world of humans; its devastating effects hit the whole natural world as well. Any disaster must fall within the sovereign will of G-d, even though G-d is not the sponsor or author of that evil.
When G-d does great, miraculous things, it is easy to believe that He is in control. When times are hard and the trials heavy, we need to believe it all the more.