People learn a lot of subjects in school, and there is awhich raises the question;: Why do you learn?

Some people say because learning is interesting, and others say because it's required tofor graduateion.

AOne character says you should learn about plants, animals, physics, chemistry, and so on, for as long as you can.

It is important to be cultivated, not to rememberorize things.

The original sentence makes it sound like remembering things is somehow bad.

Being cultivated is haventails being generousity, which means knowing love.

Even if you forget everything you learned, you will gain a dash of gold dust through your learning process.

Therefore, you have to study and bstudy to become cultivated.

Why Ddo You Lpeople want to learn?

By reading the rest of your sentences, I think what you want to ask is:

Why do people want to learn?

"Why do you learn?" seems to mean "Why do humans learn?", or "How does the human mind learn?" . Something like "Why do you want to learn?", or "Why do people want to learn?", or "What are your reasons for wanting to learn?", which is more personal, may be more like what you are wanting to say.

People learn a lot of subjects in school, and there is aat poses the question;: Why do youpeople want to learn?

The theory is in "Right and Smile" by Dazai Osamu.

You may want to add just a little bit to this, such as:

The theory is proposed in the book "Right and Smile" by Dazai Osamu.

or

The theory comes from the book "Right and Smile" by Dazai Osamu.

You can also put this sentence together with the previous sentence you wrote, so that it looks like this:

I'll introduce a theory that I was impressed with that comes from the book "Right and Smile" by Dazai Osamu.

AOne character saysin the book says that you should learn about plants, animals, physics, chemistry, and so on, as long as you can.

Why Do You Learn?

There's nothing wrong with "why do you learn", but "What's the point of learning" sounds more natural to me.
You can also say "Why learn?"

People learn about a lot of subjects in school, and there is athe question; : (Why do you learn? / What's the point of learning?)

Some people say it's because learning is interesting, and others say it's because it's required to graduate.

A character says you should learn about plants, animals, physics, chemistry, and so on, as long as you can.

You can forget what you learned and noyou don't have to be proud of your knowledge.

Being cultivated is havthe same as being generousity, which means knowing love.

Even if you forget everything you learned, you willould have gained a dash of gold dust through your learning process.