Cyrus does not know that Yahweh is helping him (Isa 45:4-45:6)

“For the sake

Of my servant Jacob,

For the sake

Of Israel my chosen one,

I call you by your name.

I surname you,

Even though you do not know me.

I am Yahweh.

There is no other.

Besides me

There is no god.

I arm you,

Even though you do not know me.

Thus they might know,

From the rising of the sun,

As well as from the west,

That there is none besides me.

I am Yahweh.

There is no other.”

Second Isaiah explains how Yahweh, who is all powerful, was helping Cyrus. Yahweh was doing this for the sake of Jacob and Israel. Even though Cyrus is not aware that Yahweh was helping and arming him, Yahweh has named him in particular. Yahweh was doing this, so that all people would know that there was no god besides him. Thus from the east to the west, they would know that Yahweh, and he alone, was responsible for the exploits of Cyrus. This is a rather large claim, much like the 20th century anonymous Christians, who did not know they were Christians.