Montag makes two important decisions. The first one is to go to Faber. He accidently met Faber one afternoon in the park, but he instinctively knows that Faber can help him. He goes to Faber and says,
"Nobody listens anymore. I can't talk to the walls because they're yelling at me. I can't talk to my wife, she listens to the walls. I just want someone to hear what I have to say. And maybe if I talk long enough it'll make sense. And I want you to teach me to understand what I read." (pg 82)
This is important because he is no longer hiding the books he is reading. He was seen on the subway holding the Bible. He is actually taking action to do something about burning the books.
One more decision Montag makes is when he starts running. The Mechanical Hound was able to stick him in the leg. He is in pain, and he realizes that Beatty is dead, Mildred has left him, Clarisse is dead, and that he has been a fool. He contemplates giving himself up. But instead he thinks,
"No, we'll save what we can, we'll do what there is left to do. If we have to burn, let's take a few more with us." (pg 123)
Later, when Faber asks Montag what he plans to do, he says, "To keep running" (pg 131)