What are the ancient poems containing "books"?

DuDu Fu DuXue in Tang Dynasty

Most of the people crying on the battlefield are the ghosts of the newly killed soldiers, only the old people who are sad to write poems.

At dusk, suddenly snowflakes are dancing in the wind.

The gourd is discarded, the wine vessel has no wine, and the stove is red.

The news of the front-line battle and the news of his wife and sisters are unknown. Sadness sits in the air with his hands in the air.

2. Tang Dynasty. Du Fu's Hope in Spring

Chang' an fell, the country was broken, and only the mountains and rivers remained; Spring has come, and the sparsely populated Chang' an city is densely forested.

Sad state, can not help but burst into tears, amazing birds, leaving sorrow and hate.

The war lasted for more than half a year, and letters from home were rare, with a hundred thousand gold.

Twisting with melancholy, scratching my head and thinking, the more I scratch my white hair, I can hardly insert a hairpin.

3. Song Dynasty. Lu You's book Anger.

When I was a child, I knew that the world was unbearable and the Central Plains looked like a mountain.

It snowed all night in the building, and the autumn wind dispersed in the iron horse.

Stuck on the Great Wall and make an empty promise, the sideburns in the mirror have long faded.

When you debut, you can say your real name, but you can't fight for a thousand years.

4. Song Dynasty. Zhu's reading thought

Half an acre of square pond opened, and the sky was overcast.

Why is the water in the pond so clear? Because there is inexhaustible living water for it.

5. Professor Bai's Caotang by Du Fu in Tang Dynasty

Bachelor of Bishan burns whitebait, and white horse walks in the rock;

The ancients used three winter feet, which are over 10 thousand years old.

Clear clouds are full of households, and the autumn waters are floating and sliding;

Since ancient times, glory and wealth must come from diligence, and knowledgeable people should read a group of books like cypress trees to seek fame.

Why do poets love to write poems about "books" or "faiths"?

In ancient times, traffic was inconvenient, and the only way to send news was to write letters. Moreover, there were few poor scholars in ancient times, so it was very difficult to study, so many people loved to write poems about books.