Please list an old saying or poem that reflects the bitterness and joy of learning.

Bitterness: There is a road to diligence in Shushan, and there is no limit to learning the sea.

Le: reading is like breaking thousands of volumes, and writing is like a god.

Well-meaning: mechanics is like ploughing, and diligence can make up for it. But if you do too many books, you will get old.

Le: The book has its own golden house, and the book has its own Yan Ruyu.

Excuse me, are these? Hope to adopt! )

No plagiarism!