Which excerpt from the number devil best shows the entertaining side of the number devil's character?

"if i'd known you were going to be such a scaredy-cat, i wouldn't have entered your dream."

"with one—i am speaking of the numeral, of course—you can do almost anything."

"i can't seem to come up with anything. you were right. it doesn't work. how did you know? "

"guessing? guessing is not allowed in mathematics! mathematics is an exact science! "