In hard times by charles dickens, the scene in which sissy and bitzer are asked to define a horse shows that nervousness prevents people from thinking clearly mr. gradgrind favors boys over girls to succeed in the school, students need to know many facts sissy has never seen a horse

In Hard Times by Charles Dickens, the scene in which Sissy and Bitzer are asked to define a horse shows that 

The correct answer is:
to succeed in the school, students need to know many facts 

It shows that knowledge cannot always be neatly encapsulated in precise definitions, by prpositional logic. As well as deriving from abstract thought, knowledge can also arise from practical experience; most of what we learn in life comes from engaging with the world around us.