Answer: He knows facts, but she uses her imagination.
Step-by-step explanation:
Sissy is a constant representation of good in the novel. She is sweet, caring, and kind. Despite having been deserted by her father and then pushed to learn the Gradgrind philosophy, she still remains the most grounding and positive energy in Coketown. However, Sissy is also fluent in imagination, creativity, as well as a doer of selfless actions.
Bitzer, on the other hand, being Gradgrind's best student, grew up into an extremely rational man who ignores any emotion and non-selfish impulse.