Answer:
The quotation that best illustrates Gradgrind's arrogance and condescension towards Sissy Jupe can be found in Charles Dickens' novel "Hard Times." One such quotation is:
"Now, what I want is, Facts. Teach these boys and girls nothing but Facts. Facts alone are wanted in life."
This quotation reflects Gradgrind's rigid and authoritarian approach to education and his dismissive attitude towards any form of imagination or creativity, which Sissy Jupe embodies. It exemplifies his condescension by reducing Sissy's background and experiences to be irrelevant in the face of his strict demand for "Facts" alone.