Happiness does not depend on what you have or who you are, it solely relies on what you think. =Happiness is a state of mind. 

快乐并非是取决于你有什么或是你是谁，它完全取决于你怎么想。 

单字记忆： 

depend [dɪˈpɛnd] vi.依赖;依靠;信赖;决定于 

depend on 依靠；依赖  

solely [ˈsoʊlli] adv.仅仅;纯粹;唯一地;独一无二地 

rely [rɪˈlaɪ] vi.依靠，倚赖，仗恃;信任，信赖