The Cattle - 6:125
Whomever Allah wishes to guide to the right path, He opens his heart to Islam (submission to God). And whomsoever He wills to lead astray, He makes his chest narrow and troubled as if he were ascending to heaven. This is how Allah puts those who do not believe in evil.
How does Allah guide?
The Jinn/72:1
"Say, "It has been revealed to me that a group of the jinn listened and said:""We have heard an interesting Qur´an."
The Jinn/72:2
It guides to the truth, and we have believed in it; henceforth we will not associate anyone with our Lord.
Council/42:52
So We revealed to you a spirit from Our Presence, and you did not know what a book was and what faith was. But We have made it a light that guides the servants whom We will to the truth. Surely you are a guide to the right path.
The Table Spread/5:15
People of the Book, our messenger has come to you, who has revealed to you many parts of the Book which you have concealed, and many of them he has not thrown in your faces. And there has come to you a light from Allah and a clear Book.
The Table Spread/5:16
By it Allah guides those who seek His pleasure to the paths of peace and tranquility, and by His permission He guides them to the straight path, bringing them out of darkness into light.
Sheva/34:6
Those who have been given knowledge see that what has been sent down to you from your Lord is the truth and that it guides to the Way of the Exalted and Most Praised.