《三国志·魏书·少帝纪》
所以所谓的 易 ，就是改变。名叫《连山》，是因为像山里涌出又吸收云气，连接天地；所谓归藏，意思就是天地万物没有不隐藏于其中的。 
故易者，变易也，名曰连山，似山出内云气，连天地也；归藏者，万事莫不归藏于其中也。 
So the so-called change is to change. The so-called “Lianshan” is because it is like a mountain, it gushes out and absorbs the clouds, and connects the heaven and the earth; the so-called “Guizang” means that all things in the heaven and the earth are hidden in it.