Study without desire spoils the memory, and it retains nothing that it takes in.
-- Leonardo da Vinci
As a college instructor that teaches only general studies classes, I can vouch for the truth of this statement. When people are disinterested in a subject, they are not likely to learn much or retain what little they did learn.
I wish that as a culture we actually valued education and knowledge. Instead, what we value is the piece of paper that we get after paying for 4 years of college and the job that we get because of it.