At the start of novel montag says was a pleasure to what ?

.... watch things burn.

From the text:

IT WAS A PLEASURE TO BURN

IT was a special pleasure to see things eaten, to see things blackened and changed. With the brass nozzle in his fists, with this great python spitting its venomous kerosene upon the world, the blood pounded in his head, and his hands were the hands of some amazing conductor playing all the symphonies of blazing and burning to bring down the tatters and charcoal ruins of history.