Please help me find the preface theme center of Send to Dongyang, Ma Shuo, Little Stone Pond, Zhushu, Yueyang Tower and Zuiweng Pavilion.

Preface to seeing Ma Shengdong Yang: Encourage Ma Sheng to study hard.

Ma said: It mocked the fatuity and incompetence of feudal rulers, attacked the social phenomenon that feudal rulers buried talents, and played a role in criticizing the current disadvantages.

Little Stone Pond: Expressing the sad feelings in a lonely situation.

Book with Zhu: Despising fate, loving nature and retiring from the world.

Yueyang Tower: Worry in the world first, and joy in the world later.

Zuiweng Pavilion: Broad-minded feelings of having fun with the people.