"I gave the mountain of books as a gift, and you received the sea of clouds as a poem" is a metaphor, which can have multiple meanings.

firstly, it can be interpreted as an attitude towards knowledge. Taking the mountain of books as a gift means that knowledge is endless, just like a mountain, which needs us to climb and explore. The sea of clouds symbolizes the vast sky and boundless world. When we master the knowledge, we can have a broader vision and more possibilities, just like swimming in the sea of clouds.

On the other hand, "I give the mountain of books as a gift" can also be understood as a modest and respectful attitude. Taking Shushan as a gift means that we regard it as a precious gift and are willing to accept and appreciate it. At the same time, we also regard our knowledge as a kind of precious wealth, and we are willing to share it with others and accept their knowledge and ideas.

generally speaking, "I take the mountain of books as a gift, and you collect the sea of clouds to make poems" is a positive attitude, which expresses the love and pursuit of knowledge, and also embodies the spirit of mutual respect and sharing between people.