Fahrenheit 451 Journal. Last long paragraph on Pg. 116. Why did Montag think that it was good to know?

I need help on what this quote means. Its about the long last paragraph in the book Fahrenheit 451. It says: A great nuzzling gout of fire leapt out to lap at the books and knock them against the wall. He stepped into the bedroom and fired twice and the win beds went up in a great simmering whisper, wi th more heat and pion and light than he would have supposed them to contain. He burn t the bedroom walls and the cosmetics chest because he wanted to change everything, the chairs, the tables, and in the dining room the silverware and plastic dished, everything that showed that he had lived here in this empty house with a strange woman who would forget him tomorrow, who has gone and quite forgotten him already, listening to her Seashell Radio pour in on her and in her on her as she rode across town, alone. And as before, it was good to burn, he felt himself gush out in the fire, snatch, rend, rip in half with flame, and putt away the senseless problem. If there was no solution, well then now there was no problem, wither. Fire was best for everything.